List of longest tunnels

| Delaware Aqueduct

| {{flagicon|USA}} New York State, United States

| {{convert|137000|m|mi|3|abbr=on}}

| 1945

| 4.1 m in diameter (13.2 m²). New York City's main water supply tunnel.

| Päijänne Water Tunnel

| {{flagicon|Finland}} Southern Finland, Finland

| {{convert|120000|m|mi|3|abbr=on}}

| 1982

| 16 m² cross section. Main water supply tunnel for the Helsinki metropolitan area in southern Finland, drilled through solid rock.

| Suzhou Metro Line 3-11

| {{flagicon|China}}Suzhou, China

| {{convert|86542|m|mi|3|abbr=on}}

| 2019–2023

| Suzhou Metro Line 11 and Line 3 are connected at Weiting station with through trains passing by. Longest metro tunnel

| Dahuofang Water Tunnel

| {{flagicon|China}} Liaoning, China

| {{convert|85320|m|mi|3|abbr=on}}

| 2009

| 8 m in diameter{{cite web |url=http://www.robbinstbm.com/case-study/dahuofang-water-tunnel/ |title=Dahuofang Water Tunnel | The Robbins Company |website=Robbinstbm.com |access-date=2016-02-01 |archive-date=22 March 2012 |archive-url=https://web.archive.org/web/20120322170135/http://www.robbinstbm.com/case-study/dahuofang-water-tunnel/ |url-status=live }} (50 m² cross section)

| Orange–Fish River Tunnel

| {{flagicon|South Africa}} South Africa

| {{convert|82800|m|mi|3|abbr=on}}

| 1972

| Longest continuous enclosed aqueduct in the Southern Hemisphere (22.5 m² cross section). Built to divert water from the Orange River to the Great Fish River.

| Bolmen Water Tunnel

| {{flagicon|Sweden}} Kronoberg/Scania, Sweden

| {{convert|82000|m|mi|3|abbr=on}}

| 1987

| 8 m² cross section

| Chengdu Metro Line 6

| {{flagicon|China}} Chengdu, China

| {{convert|68223|m|mi|3|abbr=on}}

| 2020

| Longest (independent single-line) metro/rapid transit tunnel

| Neelum–Jhelum Hydropower Tunnel

| {{flagicon|Pakistan}} Muzaffarabad, Azad Kashmir, Pakistan

| {{convert|68000|m|mi|3|abbr=on}}

| 2017

| Part of the 969 MW Neelum–Jhelum Hydropower Plant

| Tunel Emisor Oriente

| {{flagicon|Mexico}} Mexico City, Mexico

| {{convert|62500|m|mi|3|abbr=on}}

| 2019{{Cite web|url = https://www.animalpolitico.com/2019/12/tunel-emisor-oriente-inundaciones-inauguracion/|title = Tras 11 años de construcción, inauguran el Túnel Emisor Oriente|date = 23 December 2019|access-date = 22 January 2022|archive-date = 21 January 2022|archive-url = https://web.archive.org/web/20220121234839/https://www.animalpolitico.com/2019/12/tunel-emisor-oriente-inundaciones-inauguracion/|url-status = live}}

| 7 m in diameter. Longest wastewater tunnel.

| Qingdao Metro Line 1

| {{flagicon|China}} Qingdao, China

| {{convert|59818|m|mi|3|abbr=on}}

| 2020–2021

| Second longest metro/rapid transit tunnel

| Guangzhou Metro Line 18

| {{flagicon|China}} Guangzhou, China

| {{convert|58300|m|mi|3|abbr=on}}

| 2021

|

| Guangzhou Metro Line 3

| {{flagicon|China}} Guangzhou, China

| {{convert|57930|m|mi|3|abbr=on}}
(Excl. branch)

| 2005–2018

|

| Moscow Metro Bolshaya Koltsevaya line

| {{flagicon|Russia}} Moscow, Russia

| {{convert|57538|m|mi|3|abbr=on}}{{cite web | url=https://1520today.ru/blog/ne-70-km-a-57-5-kak-moskovskie-vlasti-udlinili-bolshuju-kolcevuju-liniju-metro | title=Не 70 км, а 57,5! Как московские власти «удлинили» Большую кольцевую линию метро | date=22 March 2023 | access-date=25 July 2023 | archive-date=27 March 2023 | archive-url=https://web.archive.org/web/20230327191629/https://1520today.ru/blog/ne-70-km-a-57-5-kak-moskovskie-vlasti-udlinili-bolshuju-kolcevuju-liniju-metro | url-status=live }}{{cite web | url=https://postimg.cc/bsQtrNg0 | title=IMG 20230327 063939 969 — Postimages | access-date=25 July 2023 | archive-date=27 March 2023 | archive-url=https://web.archive.org/web/20230327034230/https://postimg.cc/bsQtrNg0 | url-status=live }}
(Excl. branch)

| 2018–2023First stretch opens in 1969 as part of line 2

| Longest metro/rapid transit circular line

| Gotthard Base Tunnel

| {{flagicon|Switzerland}} Central Swiss Alps, Switzerland

| {{convert|57104|m|mi|3|abbr=on}} and {{convert|57017|m|mi|3|abbr=on}}

| 2016

| Longest conventional railway tunnel. It is also the world's longest transit tunnel by geodetic distance; {{convert|55.782|km|abbr=on}} between the two portals. Total {{convert|151.84|km|abbr=on}} of broken out tunnels through solid rocks.{{cite web |title=Project data – raw construction Gotthard Base Tunnel |url=https://www.alptransit.ch/fileadmin/dateien/media/zahlen_und_fakten/gbt_e.pdf |date=1 June 2016 |publisher=AlpTransit Gotthard Ltd |location=Lucerne, Switzerland |access-date=2016-12-15 |archive-date=11 March 2016 |archive-url=https://web.archive.org/web/20160311190816/https://www.alptransit.ch/fileadmin/dateien/media/zahlen_und_fakten/gbt_e.pdf |url-status=live }}{{cite news |url=http://www.tagesanzeiger.ch/wissen/technik/wer-hat-die-groesste-roehre/story/14922381 |title=Wer hat die grösste Röhre? |trans-title=Who has the longest tube? |type=graphical animation |newspaper=Tages-Anzeiger |location=Zurich, Switzerland |date=14 April 2016 |language=de |access-date=2016-05-11 |archive-date=29 April 2016 |archive-url=https://web.archive.org/web/20160429131605/http://www.tagesanzeiger.ch/wissen/technik/Wer-hat-die-groesste-Roehre/story/14922381 |url-status=live }} Part of the NRLA.

| Beijing Subway Line 10

| {{flagicon|China}} Beijing, China

| {{convert|57100|m|mi|3|abbr=on}}

| 2008–2013

|

| Seikan Tunnel

| {{flagicon|Japan}} Tsugaru Strait, Japan

| {{convert|53850|m|mi|3|abbr=on}}

| 1988

| 74 m²; longest railway tunnel until 2016. Longest tunnel with an undersea section, running between Honshu and Hokkaido. Undersea section measures 23.3 kilometres (14.5 mi).

| Beijing Subway Line 6

| {{flagicon|China}} Beijing, China

| {{convert|53400|m|mi|3|abbr=on}}

| 2012–2018

|

| Želivka Water Tunnel{{cite web|first1=Vladislav|last1=Mug|first2=Vladislav|last2=Konvicka|trans-title=Underground World: Stola Water Delivery Conduit from the Water Tank Želivka to Prague|url=https://translate.google.com/translate?hl=en&sl=cs&tl=en&u=http%3A%2F%2Fwww.hornictvi.info%2Fpodzemi%2Fzelivka%2F02.htm|language=cs|title=Štolový vodovodní přivaděč z vodní nádrže Želivka do Prahy|year=2009|access-date=27 February 2010|archive-date=17 August 2014|archive-url=https://web.archive.org/web/20140817065627/http://translate.google.com/translate?hl=en&sl=cs&tl=en&u=http%3A%2F%2Fwww.hornictvi.info%2Fpodzemi%2Fzelivka%2F02.htm|url-status=live}}

| {{flagicon|Czech Republic}} Central Bohemian Region, Czech Republic

| {{convert|51970|m|mi|3|abbr=on}}

| 1972

| 9–12 m²

| Seoul Subway: Line 5

| {{flagicon|South Korea}} Seoul, South Korea

| {{convert|51700|m|mi|3|abbr=on}}
(longest branch)

| 1995–2021

| Longest metro/rapid transit tunnel until Guangzhou Metro Line 3 extension opened in 2010, crosses west to east under the Seoul Capital Area.

| Istanbul Metro (Line M11)

| {{flagicon|Turkey}} Istanbul, Turkey

| {{convert|51500|m|mi|3|abbr=on}}

| 2023–2024

| Longest tunnel in Turkey

| Rothschönberger Stolln{{cite web |url=https://slon.diamo.cz/hpvt/2002/sekce/tradice/T%2002.htm |access-date=2022-12-26 |title=125 Jahre Rothschönberger Stolln |last=Wagenbreth |first=Otfried |year=2002 |language=de |archive-date=4 April 2023 |archive-url=https://web.archive.org/web/20230404080438/https://slon.diamo.cz/hpvt/2002/sekce/tradice/T%2002.htm |url-status=live }}

| {{flagicon|Germany}} Freiberg Mining Field, Germany

| {{convert|50900|m|mi|3|abbr=on}}

| 1844–1882

| 6 m² cross section, longest tunnel until 1945. Part of a UNESCO World Heritage Site.

| Channel Tunnel

| {{flagicon|United Kingdom}} {{flagicon|France}} English Channel, United Kingdom/France

| {{convert|50450|m|mi|3|abbr=on}}

| 1994

| Second longest railway tunnel until 2016. Longest underwater section, longest international tunnel (2×45 m² + 1×18 m²), running between Folkestone, Kent, and Coquelles, Pas-de-Calais.

| Yulhyeon Tunnel

| {{flagicon|South Korea}} Seoul Capital Area, South Korea

| {{convert|50300|m|mi|3|abbr=on}}{{cite web|url=https://www.tunneltalk.com/Korea-14Jul2015-Yulhyeon-Tunnel-final-breakthrough.php|title=Korea completes record setting rail excavation|website=Tunneltalk.com|access-date=16 June 2019}}

| 2016{{cite web|url=http://english.visitkorea.or.kr/enu/AKR/FU_EN_15.jsp?cid=2441781|title=- Official Korea Tourism Organization|website=english.visitkorea.or.kr|access-date=16 June 2019|archive-date=18 April 2022|archive-url=https://web.archive.org/web/20220418171646/https://english.visitkorea.or.kr/enu/AKR/FU_EN_15.jsp?cid=2441781|url-status=dead}}

| 107 m², part of the Suseo high-speed railway.

| River Arpa – Lake Sevan tunnel{{cite web|url=http://gidrospetsproekt.ru/en/geografiya-obektov/image-map_rossija/armeniya/arpa-sevan-connecting-tunnel.html|title=Гидроспецпроект/Arpa-Sevan connecting tunnel|website=gidrospetsproekt.ru|access-date=16 June 2019|archive-date=6 November 2020|archive-url=https://web.archive.org/web/20201106180250/http://gidrospetsproekt.ru/en/geografiya-obektov/image-map_rossija/armeniya/arpa-sevan-connecting-tunnel.html|url-status=live}}{{Cite web|url=http://arpa-sevan.am/en/1961-1981-the-complex-of-hydraulic-works-for-transfer-of-the-arpa-and-yeghegis/|title=1961-1981 the Complex of Hydraulic Works for Transfer of the Arpa and Yeghegis | Arpa Sevan|access-date=21 January 2022|archive-date=22 November 2021|archive-url=https://web.archive.org/web/20211122052928/http://arpa-sevan.am/en/1961-1981-the-complex-of-hydraulic-works-for-transfer-of-the-arpa-and-yeghegis/|url-status=live}}

| {{flagicon|Armenia}} Armenia (at the time of construction {{flagicon|USSR}} Soviet Union)

| {{convert|48358|m|mi|3|abbr=on}}{{Cite web|url=http://arpa-sevan.am/en/1968-1980-construction-of-tunnel-no-2-and-of-arpa-sevan-conduit/|title=1968-1980 Construction of Tunnel No.2 and of Arpa-Sevan Conduit | Arpa Sevan|access-date=21 January 2022|archive-date=28 March 2022|archive-url=https://web.archive.org/web/20220328104243/http://arpa-sevan.am/en/1968-1980-construction-of-tunnel-no-2-and-of-arpa-sevan-conduit/|url-status=live}}

| 1981

| Longest tunnel built to restore ecological balance. Transfers water from the Arpa to Lake Sevan to recover its level.{{cite web|url=http://thisweekinarmenianhistory.blogspot.com/2016/03/inauguration-of-arpa-sevan-tunnel-march.html|title=This Week In Armenian History: Inauguration of the Arpa-Sevan Tunnel (March 21, 1981)|date=21 March 2016|website=Thisweekinarmenianhistory.blogspot.com|access-date=16 June 2019|archive-date=13 April 2019|archive-url=https://web.archive.org/web/20190413140400/http://thisweekinarmenianhistory.blogspot.com/2016/03/inauguration-of-arpa-sevan-tunnel-march.html|url-status=live}}

| Pahang – Selangor Raw Water Transfer Project{{Cite web|url=http://www.therobbinscompany.com/en/case-study/pahang-selangor-malaysia/|title=Pahang Selangor Raw Water Tunnel {{!}} The Robbins Company|website=Therobbinscompany.com|access-date=2016-05-30|archive-url=https://web.archive.org/web/20160701124812/http://www.therobbinscompany.com/en/case-study/pahang-selangor-malaysia/|archive-date=1 July 2016|url-status=dead}}{{Cite web|url=http://www.kettha.gov.my/portal/index.php?r=kandungan/index&menu1_id=1&menu2_id=92&menu3_id=157|title=Laman Web Rasmi Kementerian Tenaga, Teknologi Hijau dan Air|website=Kettha.gov.my|access-date=2016-05-30|archive-url=https://web.archive.org/web/20180724232231/http://www.kettha.gov.my/portal/index.php?r=kandungan%2Findex&menu1_id=1&menu2_id=92&menu3_id=157|archive-date=24 July 2018|url-status=dead}}

| {{flagicon|Malaysia}} Pahang & Selangor, Malaysia

| {{convert|44600|m|mi|3|abbr=on}}

| 2014

| 5.2 m in diameter

| Wuhan Metro Line 2

| {{flagicon|China}} Wuhan, China

| {{convert|44347|m|mi|3|abbr=on}}

| 2012–2019

| Lyublinsko-Dmitrovskaya Line (Zyablikovo – Fiztekh)

| {{flagicon|Russia}} Moscow Metro, Russia (construction started at the time of {{Flagicon|Soviet Union}} Soviet Union)

| {{convert|44300|m|mi|3|abbr=on}}

| 1995–2023

|

| Shanghai Subway: Line 7

| {{flagicon|China}} Shanghai, China

| {{convert|44200|m|mi|3|abbr=on}}

| 2009–2010

|

| #1 Tunnel, Yellow River Diversion to Shanxi North Line

| {{flagicon|China}} Shanxi, China

| {{convert|43670|m|mi|3|abbr=on}}

| 2011

| See South–North Water Transfer Project

| #7 Tunnel, Yellow River Diversion to Shanxi South Line

| {{flagicon|China}} Shanxi, China

| {{convert|43500|m|mi|3|abbr=on}}

| 2002

| See South–North Water Transfer Project

| Beijing Subway Line 8

| {{flagicon|China}} Beijing, China

| {{convert|42600|m|mi|3|abbr=on}}

| 2012–2021

|

| Shanghai Metro Line 15

| {{flagicon|China}} Shanghai, China

| {{convert|42300|m|mi|3|abbr=on}}

| 2021

|

| Chengdu Metro Line 5

| {{flagicon|China}} Chengdu, China

| {{convert|42300|m|mi|3|abbr=on}}

| 2019

|

| Beijing Subway Line 14

| {{flagicon|China}} Beijing, China

| {{convert|42000|m|mi|3|abbr=on}}

| 2015–2021

|

| Tianjin Metro Line 6

| {{flagicon|China}} Tianjin, China

| {{convert|42000|m|mi|3|abbr=on}}

| 2016–2021

|

| Downtown line

| {{flagicon|Singapore}} MRT, Singapore

| {{convert|41900|m|mi|3|abbr=on}}{{Cite news|url=https://www.straitstimes.com/singapore/transport/downtown-line-3-officially-opened-khaw-announces-plans-to-make-transfers-between|title=Downtown Line 3 officially opens; Khaw Boon Wan announces review of fares incurred when switching between stations | the Straits Times|newspaper=The Straits Times|date=20 October 2017|access-date=1 February 2022|archive-date=3 July 2019|archive-url=https://web.archive.org/web/20190703111106/https://www.straitstimes.com/singapore/transport/downtown-line-3-officially-opened-khaw-announces-plans-to-make-transfers-between|url-status=live}}{{cite web |url=http://www.lta.gov.sg/content/ltaweb/en/public-transport/projects/downtown-line/stages.html |title=Stages | Land Transport Authority |website=lta.gov.sg |access-date=5 February 2022 |archive-url=https://web.archive.org/web/20140703122517/http://www.lta.gov.sg/content/ltaweb/en/public-transport/projects/downtown-line/stages.html |archive-date=3 July 2014 |url-status=dead}}

| 2013–2017

| Longest rapid transit line in South East Asia

| Nanjing Metro Line 3

| {{flagicon|China}} Nanjing, China

|{{convert|41567|m|mi|3|abbr=on}}

| 2011–2015

| From Xinghuolu station to Mozhoudonglu station.

| Suzhou Metro: Line 4

| {{flagicon|China}} Suzhou, China

| {{convert|41500|m|mi|3|abbr=on}}

| 2017

|

| Serpukhovsko-Timiryazevskaya Line (Altufyevo – Bulvar Dmitriya Donskogo)

| {{flagicon|Russia}} Moscow Metro, Russia (construction started at the time of {{flagicon|USSR}} Soviet Union)

| {{convert|41470|m|mi|3|abbr=on}}

| 1983–2002

|

| Madrid Metro: Line 12 (MetroSur)

| {{flagicon|Spain}} Madrid, Spain

| {{convert|40900|m|mi|3|abbr=on}}

| 1999–2003

|

| Tocho-mae – Shiodome – Hikarigaoka (Toei Oedo Line)

| {{flagicon|Japan}} Tokyo, Japan

| {{convert|40700|m|mi|3|abbr=on}}

| 1991–2000

| Tokyo Metropolitan Bureau of Transportation

| Kárahnjúkar Hydropower Plant

| {{flagicon|Iceland}} Fljótsdalshreppur, Iceland

| {{convert|39700|m|mi|3|abbr=on}}

| 2003–2007

| 7.2–7.6 meters in diameter (45 m² cross section). Part of a wider complex of tunnels that are 72 kilometers in length combined.

| Quabbin Aqueduct

| {{flagicon|USA}} Massachusetts, United States

| {{convert|39600|m|mi|3|abbr=on}}

| 1933

|

| Chengdu Metro Line 4

| {{flagicon|China}} Chengdu, China

| {{convert|39300|m|mi|3|abbr=on}}

| 2015–2017

|

| Chengdu Metro Line 7

| {{flagicon|China}} Chengdu, China

| {{convert|38600|m|mi|3|abbr=on}}

| 2017

|

| Seoul Subway: Line 3 (Apgujeong–Ogeum)

| {{flagicon|South Korea}} Seoul, South Korea

| {{convert|38200|m|mi|3|abbr=on}}

| 1985–2010

|

| Kaluzhsko-Rizhskaya Line (Novoyasenevskaya – Medvedkovo)

| {{flagicon|Russia}} Moscow Metro, Russia (at the time of construction {{flagicon|USSR}} Soviet Union)

| {{convert|37800|m|mi|3|abbr=on}}

| 1958–1990

| Longest railway tunnel 1978–1984 and from November 1987 till March 1988; longest metro/rapid transit tunnel 1990–1995

| Shenzhen Subway: Luobao Line

| {{flagicon|China}} Shenzhen, China

| {{convert|37497|m|mi|3|abbr=on}}

| 2009–2011

|

| Chengdu Metro Line 1

|{{flagicon|China}} Chengdu, China

| {{convert|37470|m|mi|3|abbr=on}}
(Excl. branch)

| 2010–2018

|

| Harold D. Roberts Tunnel{{Cite web|last=Wahlstrom|first=Ernest E|year=1974|title=History of Geologic Investigations, Engineering Design, and Construction Methods of the Harold D. Roberts Tunnel, Colorado|url=https://pubs.usgs.gov/pp/0831a/report.pdf|access-date=30 October 2020|archive-date=24 October 2020|archive-url=https://web.archive.org/web/20201024151144/https://pubs.usgs.gov/pp/0831a/report.pdf|url-status=live}}

| {{flagicon|USA}} Colorado, United States

| {{convert|37464|m|mi|3|abbr=on}}

| 1962

| Diverts water from the Colorado River watershed to the South Platte River watershed for use in the Denver metropolitan area. Flows across Continental Divide. 4,465 feet (1,361 m) below the surface at its deepest point.

| Shenzhen Subway: Shekou Line

| {{flagicon|China}} Shenzhen, China

| {{convert|36146|m|mi|3|abbr=on}}

| 2010–2011

|

| Dawushan Tunnel, Niulan River Diversion to Dianchi

| {{flagicon|China}} Yunnan, China

| {{convert|36137|m|mi|3|abbr=on}}

| 2013

|

| Circle line

| {{flagicon|Singapore}} MRT, Singapore

| {{convert|35700|m|mi|3|abbr=on}}

| 2009–2012

|

| Busan Metro: Line 2 (Dongwon–Jangsan)

| {{flagicon|South Korea}} Busan, South Korea

| {{convert|35500|m|mi|3|abbr=on}}

| 1999–2009

|

| Songshan Lake Tunnel{{cite web |url=http://gd.sina.com.cn/dg/news/2014-06-18/12022957.html |title=莞惠城际最快明年启用 松山湖隧道长38公里_新浪东莞 |publisher=Sina Corp |access-date=2016-02-01 |archive-url=https://web.archive.org/web/20160120170635/http://gd.sina.com.cn/dg/news/2014-06-18/12022957.html |archive-date=20 January 2016 |url-status=dead }}

| {{flagicon|China}} Dongguan, China

| {{convert|35391|m|mi|3|abbr=on}}

| 2016

| Dongguan–Huizhou intercity railway, longest railway tunnel in China

| Seoul Subway: Line 6

| {{flagicon|South Korea}} Seoul, South Korea

| {{convert|35100|m|mi|3|abbr=on}}

| 2001

|

| Seoul Subway: Line 7 (Cheongdam–Bupyeong-gu Office)

| {{flagicon|South Korea}} Seoul, Incheon, Bucheon and Gwangmyeong in South Korea

| {{convert|35100|m|mi|3|abbr=on}}

| 2000–2012

|

| Tianjin Metro: Line 5

| | {{flagicon|China}} Tianjin, China

| {{convert|34800|m|mi|3|abbr=on}}

| 2018–2021

|

| Lötschberg Base Tunnel

| {{flagicon|Switzerland}} Bernese Alps, Switzerland

| {{convert|34577|m|mi|3|abbr=on}}

| 2007

| Longest land railway tunnel until Gotthard Base Tunnel was opened; two single track tubes along 12 km, only single track along 22 km. Part of the NRLA.

| Istanbul Metro (Line M4)

| {{flagicon|Turkey}} Istanbul, Turkey

| {{convert|34050|m|mi|3|abbr=on}}

| 2012

|

| Tyne-Tees Tunnel

|{{flagicon|United Kingdom}} England, United Kingdom

| {{convert|34000|m|mi|3|abbr=on}}

| 1983 (and earlier)

| Northumbrian water supply tunnel.

| Guangzhou Metro: Line 8

|{{flagicon|China}} Guangzhou, China

| {{convert|33900|m|mi|3|abbr=on}}

| 2010–2020

|

| Madrid Metro: Line 7

| {{flagicon|Spain}} Madrid, Spain

| {{convert|32919|m|mi|3|abbr=on}}

| 1974–2007

|

| New Guanjiao Tunnel

| {{flagicon|China}} Qinghai, China

| {{convert|32645|m|mi|3|abbr=on}}

| 2014{{cite web|url=http://news.xinhuanet.com/fortune/2014-04/15/c_1110253248.htm|archive-url=https://web.archive.org/web/20140419054737/http://news.xinhuanet.com/fortune/2014-04/15/c_1110253248.htm|url-status=dead|archive-date=19 April 2014|title=世界最长高原铁路隧道——新关角隧道贯通|agency=Xinhua News Agency|access-date=1 February 2016}}

| Longest tunnel on the upgraded dual-track Xining–Golmud section of Qinghai–Tibet Railway, longest railway tunnel in China until 2016, 3323.58–3380.97 meters above sea level

| Meijo Line – Meikō Line

| {{flagicon|Japan}} Nagoya Municipal Subway, Japan

| {{convert|32400|m|mi|3|abbr=on}}

| 1965–2004

|

| Guangzhou Metro: Line 2

| {{flagicon|China}} Guangzhou, China

| {{convert|32000|m|mi|3|abbr=on}}

| 2010

|

| Rathaus Spandau–Rudow (U7)

| {{flagicon|Germany}} Berlin U-Bahn, Germany

| {{convert|31800|m|mi|3|abbr=on}}

| 1924–1984

|

| Gerede Water Transmission Tunnel{{Cite web|url=https://www.tunnelsonline.info/news/gerede-water-tunnel-excavation-finally-over-7020876|title=Breakthrough on the Gerede Water Transmission Tunnel - Tunnels & Tunnelling International|website=tunnelsonline.info|date=5 March 2019 |access-date=1 February 2022|archive-date=1 February 2022|archive-url=https://web.archive.org/web/20220201125045/https://www.tunnelsonline.info/news/gerede-water-tunnel-excavation-finally-over-7020876|url-status=live}}

| {{flagicon|Turkey}} Ankara, Turkey

| {{convert|31592|m|mi|3|abbr=on}}

| 2019{{Cite web|url=https://www.robbinstbm.com/ru/projects/gerede-water-transmission-tunnel/|title=Gerede Water Transmission Tunnel|website=Robbins|access-date=1 February 2022|archive-date=1 February 2022|archive-url=https://web.archive.org/web/20220201194139/https://www.robbinstbm.com/ru/projects/gerede-water-transmission-tunnel/|url-status=live}}

| 5.2 m in diameter

| Seoul Subway: Bundang Line (Seoul Forest–Jukjeon)

| {{flagicon|South Korea}} Seoul, Seongnam and Yongin in South Korea

| {{convert|31400|m|mi|3|abbr=on}}

| 1994–2012

|

| Daegu Metro: Line 2

| {{flagicon|South Korea}} Daegu and Gyeongsan in South Korea

| {{convert|31400|m|mi|3|abbr=on}}

| 2005–2012

|

| Milwaukee Metropolitan Sewerage District Deep Tunnel Phase 1

| {{flagicon|USA}} Milwaukee County, Wisconsin, United States

| {{convert|31221|m|mi|3|abbr=on}}

| 1993

| 405 million gallons of combined sewage storage designed to prevent sewage overflow into Lake Michigan. The largest of three phases, totalling 521 million gallons of storage.{{cite web |title=Milwaukee Deep Tunnels |url=https://www.mmsd.com/what-we-do/wastewater-treatment/deep-tunnel |website=MMSD.com |date=13 August 2020 |access-date=6 June 2021 |archive-date=6 June 2021 |archive-url=https://web.archive.org/web/20210606184313/https://www.mmsd.com/what-we-do/wastewater-treatment/deep-tunnel |url-status=live }}

| Beijing Subway: Line 1

| {{flagicon|China}} Beijing, China

| {{convert|31040|m|mi|3|abbr=on}}

| 1971–2000

|

| Bucharest Metro: Line M1

| {{flagicon|Romania}} Bucharest, Romania

| {{convert|31010|m|mi|3|abbr=on}}

| 1979–1992

| 8,670 m, shared with M3 line. Nether less one continuous tunnel.

| Côte-Vertu – Montmorency (Line 2 Orange)

| {{flagicon|Canada}} Montreal Metro, Canada

| {{convert|30798|m|mi|3|abbr=on}}

| 1966–2007

|

| Shanghai Subway: Line 2

| {{flagicon|China}} Shanghai, China

| {{convert|30187|m|mi|3|abbr=on}}

| 2000

|

| Parnas – Kupchino (line 2)

| {{flagicon|Russia}} Saint Petersburg Metro, Russia (construction started at the time of {{flagicon|USSR}} Soviet Union)

| {{convert|30100|m|mi|3|abbr=on}}

| 1961–2006

|

| Guangzhou Metro: Line 5

| {{flagicon|China}} Guangzhou, China

| {{convert|29900|m|mi|3|abbr=on}}

| 2009

|

| Shandaken Tunnel

| {{flagicon|United States}} Catskill Mountains, New York, United States

| {{convert|29780|m|mi|3|abbr=on}}

| 1924

|

| Shanghai Subway: Line 8

| {{flagicon|China}} Shanghai, China

| {{convert|29650|m|mi|3|abbr=on}}

| 2007–2009

|

| Prospekt Veteranov – Devyatkino (line 1)

| {{flagicon|Russia}} Saint Petersburg Metro, Russia (at the time of construction {{flagicon|USSR}} Soviet Union)

| {{convert|29600|m|mi|3|abbr=on}}

| 1955–1978

|

| Shanghai Subway: Line 10

| {{flagicon|China}} Shanghai, China

| {{convert|29600|m|mi|3|abbr=on}}

| 2010

|

| Evinos – Mornos Tunnel{{cite web |url=http://www.selitunnel.com/pdf_articoli/9.PDF |title=EVINOS-MORNOS TUNNEL – GREECE |website=Selitunnel.com |access-date=2016-02-01 |archive-date=13 May 2019 |archive-url=https://web.archive.org/web/20190513015626/http://www.selitunnel.com/pdf_articoli/9.PDF |url-status=live }}{{cite web |url=http://new.onemine.org/search/summary.cfm/EvinosMornos-Tunnel--Greece-Construction-of-a-30-Km-Long-Hydraulic-Tunnel-in-Less-Than-Three-Years-Under-the-Most-Adverse-Geological-Conditions?d=4196E212BCD1388ED3A7769E6B77DD7AF1E26CB727E7188DA9D6416E43747A8F37321 |title= Evinos-Mornos Tunnel – Greece Construction of a 30 km Long Hydraulic Tunnel in Less Than Three Years Under the Most Adverse Geological Conditions – Document Summary|website=new.onemine.org |archive-url=https://web.archive.org/web/20131213003221/http://new.onemine.org/search/summary.cfm/EvinosMornos-Tunnel--Greece-Construction-of-a-30-Km-Long-Hydraulic-Tunnel-in-Less-Than-Three-Years-Under-the-Most-Adverse-Geological-Conditions?d=4196E212BCD1388ED3A7769E6B77DD7AF1E26CB727E7188DA9D6416E43747A8F37321 |archive-date=13 December 2013}}

| {{flagicon|Greece}} Aetolia-Acarnania, Greece

| {{convert|29400|m|mi|3|abbr=on}}

| 1995

|

| Chengdu Metro Line 2

| {{flagicon|China}} Chengdu, China

| {{convert|29000|m|mi|3|abbr=on}}

| 2012–2013

| Only includes phases 1 and 2

| Hultman Aqueduct{{cite web | pages = 7–26 | url = http://www.mwra.com/publications/masterplan/2006/water.pdf | title = Water System Master Plan | author = Massachusetts Water Resources Authority | date = December 2006 | author-link = Massachusetts Water Resources Authority | access-date = 7 July 2013 | archive-date = 4 March 2016 | archive-url = https://web.archive.org/web/20160304185120/http://www.mwra.com/publications/masterplan/2006/water.pdf | url-status = live }}

| {{flagicon|United States}} Eastern Massachusetts, United States

| {{convert|28640|m|mi|3|abbr=on}}

| 1939

| {{convert|11.5|ft|m|1|abbr=on}} to {{convert|14|ft|m|1|abbr=on}} diameter (15m² cross section); offline for rehabilitation

| Sydney Metro City

| {{Flagicon|Australia}} Sydney, New South Wales, Australia

| {{convert|28500|m|mi|3|abbr=on}}

| 2019-2024

| The line runs from Sydenham to Chatswood and extends to the 13 km Epping to Chatswood rail link. It forms part of the wider Sydney Metro project.

| Guadarrama Tunnel{{cite web|url=http://en.structurae.de/structures/data/index.cfm?id=s0007961|title=Guadarrama Tunnel|work=Structurae|access-date=1 February 2016|archive-date=5 October 2013|archive-url=https://web.archive.org/web/20131005141750/http://en.structurae.de/structures/data/index.cfm?id=s0007961|url-status=live}}

| {{flagicon|Spain}} Sierra de Guadarrama, Spain

| {{convert|28377|m|mi|3|abbr=on}}

| 2007

|

| MetroWest Water Supply Tunnel{{cite web | pages = 7–25 | url = http://www.mwra.com/publications/masterplan/2006/water.pdf | title = Water System Master Plan | author = Massachusetts Water Resources Authority | date = December 2006 | author-link = Massachusetts Water Resources Authority | access-date = 7 July 2013 | archive-date = 4 March 2016 | archive-url = https://web.archive.org/web/20160304185120/http://www.mwra.com/publications/masterplan/2006/water.pdf | url-status = live }}

| {{flagicon|United States}} Eastern Massachusetts, United States

| {{convert|28300|m|mi|3|abbr=on}}

| 2003

| {{convert|14|ft|m|1|abbr=on}} diameter (15m² cross section)

| West Qinling Tunnel

| {{flagicon|China}} Gansu, China

| {{convert|28236|m|mi|3|abbr=on}}

| 2016

| Chongqing–Lanzhou railway

| Taipei Metro: Blue Line

| {{flagicon|Taiwan}} Taipei, Taiwan

| {{convert|28200|m|mi|3|abbr=on}}

| 1999–2015

|

| Beijing Subway: Line 4

| {{flagicon|China}} Beijing, China

| {{convert|28165|m|mi|3|abbr=on}}

| 2009–2010

|

| Seoul Subway: Line 9 (Gimpo Airport–Sports Complex)

| {{flagicon|South Korea}} Seoul, South Korea

| {{convert|28100|m|mi|3|abbr=on}}

| 2009–2015

|

| Taihang Tunnel{{cite web |url=http://www.tunnelintelligence.com/awards-in-detail-50.html |title=Awards |website=tunnelintelligence.com |archive-url=https://web.archive.org/web/20120208134434/http://www.tunnelintelligence.com/awards-in-detail-50.html |archive-date=8 February 2012}}

| {{flagicon|China}} Taihang Mountains, China

| {{convert|27848|m|mi|3|abbr=on}}

| 2007

| On Shijiazhuang–Taiyuan high-speed railway

| Morden–East Finchley (Northern line)

| {{flagicon|United Kingdom}} London Underground, England, United Kingdom

| {{convert|27800|m|mi|3|abbr=on}}

| 1890–1940

| Longest railway tunnel in UK

| Shenyang Subway: Line 1

| {{flagicon|China}} Shenyang, China

| {{convert|27800|m|mi|3|abbr=on}}

| 2010

|

| Melamchi Water Tunnel

| {{flagicon|Nepal}} Melamchi to Kathmandu, Nepal

| {{convert|27000|m|mi|3|abbr=on}}

| 2021{{Cite web|title=Water from Melamchi finally arrives in Kathmandu|url=https://kathmandupost.com/valley/2021/03/07/water-from-melamchi-finally-arrives-in-kathmandu|access-date=2021-04-21|website=kathmandupost.com|language=English|archive-date=2 February 2022|archive-url=https://web.archive.org/web/20220202002752/https://kathmandupost.com/valley/2021/03/07/water-from-melamchi-finally-arrives-in-kathmandu|url-status=live}}

| See Melamchi Water Supply Project

| Seoul Subway: Incheon Line 1 (Bakchon–International Business District)

| {{flagicon|South Korea}} Incheon, South Korea

| {{convert|27000|m|mi|3|abbr=on}}

| 1999–2009

|

| Dainichi–Nagahara (Tanimachi Line)

| {{flagicon|Japan}} Osaka Metro, Japan

| {{convert|26900|m|mi|3|abbr=on}}

| 1967–1983

|

| LEP Tunnel{{cite web|url=http://public.web.cern.ch/public/en/LHC/Facts-en.html|title=The LHC, Facts and figures|publisher=CERN|year=2008|access-date=2 July 2009|archive-date=16 July 2009|archive-url=https://web.archive.org/web/20090716140645/http://public.web.cern.ch/public/en/LHC/Facts-en.html|url-status=live}}

| {{flagicon|Switzerland}} {{flagicon|France}} CERN, Switzerland/France

| {{convert|26659|m|mi|3|abbr=on}}

| 1988 (breakthrough)

| 11.3–15.9 m² circular ring, now used by Large Hadron Collider

| Hakkōda Tunnel (Tōhoku Shinkansen)

| {{flagicon|Japan}} Hakkōda Mountains, Japan

| {{convert|26455|m|mi|3|abbr=on}}

| 2010

| 64–74 m²

| Şanlıurfa Irrigation Tunnels

| {{flagicon|Turkey}} Turkey

| {{convert|26400|m|mi|3|abbr=on}}

| 2005{{cite web|title=Şanlıurfa Sulama Tünelleri ve Tesisleri İnşaatı |url=http://www.ereninsaatas.com/site/t9.php |publisher=Eren İnşaatı |access-date=1 October 2010 |language=tr |url-status=dead |archive-url=https://web.archive.org/web/20110710195319/http://www.ereninsaatas.com/site/t9.php |archive-date=10 July 2011 }}

|

| Shanghai Subway: Line 9

| {{flagicon|China}} Shanghai, China

| {{convert|26263|m|mi|3|abbr=on}}

| 2007–2010

|

| Gilgel Gibe II Power Station headrace tunnel

| {{flagicon|Ethiopia}} Ethiopia

| {{convert|26000|m|mi|3|abbr=on}}

| 2005–2009

| Tunnel partially collapsed, was repaired in 2010.{{cite web|url=http://www.tunneltalk.com/Gilgel-Gibe-II-Feb10-collapse.php|title=Collapse of headrace tunnel after grand opening|publisher=Tunnel Talk|access-date=27 September 2010|date=February 2010|archive-date=20 September 2012|archive-url=https://web.archive.org/web/20120920061557/http://tunneltalk.com/Gilgel-Gibe-II-Feb10-collapse.php|url-status=live}}{{cite web|url=http://nazret.com/blog/index.php/2010/12/27/ethiopia-s-gilgel-gibe-ii-hydropower-plant-resumes-operation|title=Ethiopia's Gilgel Gibe II hydropower plant resumes operation|website=nazret.com|access-date=16 June 2019|archive-date=6 October 2017|archive-url=https://web.archive.org/web/20171006170512/http://nazret.com/blog/index.php/2010/12/27/ethiopia-s-gilgel-gibe-ii-hydropower-plant-resumes-operation|url-status=live}}

| #5 Tunnel, Yellow River Diversion to Shanxi South Line

| {{flagicon|China}} Shanxi, China

| {{convert|26000|m|mi|3|abbr=on}}

| 2002

| See South–North Water Transfer Project

| Daegu Metro: Line 1

| {{flagicon|South Korea}} Daegu, South Korea

| {{convert|25900|m|mi|3|abbr=on}}

| 1997–2002

|

| MRT Blue Line

| {{flagicon|Thailand}} Bangkok, Thailand

| {{convert|25800|m|mi|3|abbr=on}}

| 2004

| Second phase opened in September 2019

| Iwate-Ichinohe Tunnel

| {{flagicon|Japan}} Ōu Mountains, Japan

| {{convert|25810|m|mi|3|abbr=on}}

| 2002

|Part of the Tōhoku Shinkansen

| Sudbury Aqueduct

| {{flagicon|United States}} Eastern Massachusetts, United States

| {{convert|25750|m|mi|3|abbr=on}}

| 1878

| Emergency backup use

| Suzhou Metro: Line 1

| {{flagicon|China}} Suzhou, China

| {{convert|25739|m|mi|3|abbr=on}}

| 2007–2011

|

| Line 3 (Athens Metro)

| {{flagicon|Greece}} Athens, Greece

| {{convert|25200|m|mi|3|abbr=on}}

| 1992–2022

| Line 3 is actually 46.5 km long, but only 25.2 km of it are underground.

| Helsinki metro (Kivenlahti–Sörnäinen)

| {{flagicon|Finland}}

Espoo and Helsinki, Finland

| {{convert|25200|m|mi|3|abbr=on}}

| 1982–2022

|

| Taipei Metro: Orange Line (Huilong – Nanshijiao)

| {{flagicon|Taiwan}} Taipei, Taiwan

| {{convert|25100|m|mi|3|abbr=on}}
(Excl. branch)

| 1998–2013

|

| Musil Tunnel{{cite web |url=http://kr.news.yahoo.com/service/news/shellview.htm?linkid=441&articleid=20100909182956897l6&newssetid=5 |script-title=ko:원주~제천 중앙선 복선전철 2011년 6월 착공 |language=ko |date=2010-09-09 |publisher=Yahoo! |access-date=19 October 2010 |archive-date=26 May 2024 |archive-url=https://archive.today/20240526062213/https://www.webcitation.org/6Af1Q53jQ?url=http://kr.news.yahoo.com/service/news/shellview.htm%3Flinkid=441 |url-status=dead }}{{cite web |url=http://www.cse.co.kr/eng/results/res_D.asp?idx=296 |title=Feasibility study and basic plan of Jungang Line for double track between Wonju and Jecheon |publisher=Chunsuk Engineering |access-date=19 October 2010 |archive-url=https://web.archive.org/web/20110722133253/http://www.cse.co.kr/eng/results/res_D.asp?idx=296 |archive-date=22 July 2011 |url-status=dead}}

| {{flagicon|South Korea}} Wonju–Jecheon (Jungang Line), South Korea

| {{convert|25080|m|mi|3|abbr=on}}

| 2021{{cite web | url=http://www.koreaherald.com/view.php?ud=20210104000981&ACE_SEARCH=1 | title=Korea unveils new low-carbon bullet train | date=4 January 2021 }}

|

| Pajares Base Tunnel

| {{flagicon|Spain}} Asturias/León, Spain

| {{convert|24667|m|mi|3|abbr=on}}

| 2023

|

| Lærdal Tunnel

| {{flagicon|Norway}} Lærdal – Aurland, Norway

| {{convert|24510|m|mi|3|abbr=on}}

| 2000

| World's longest road tunnel

| Yellow Line (Delhi Metro): GTB Nagar – Qutub Minar{{cite web|url=http://news.webindia123.com/news/articles/India/20100829/1576007.html|title=Gurgaon Metro set for operationalisation next week|website=News.webindia123.com|access-date=1 February 2016|archive-date=30 November 2019|archive-url=https://web.archive.org/web/20191130195040/https://news.webindia123.com/news/articles/India/20100829/1576007.html|url-status=dead}}

| {{flagicon|India}} Delhi, India

| {{convert|24000|m|mi|3|abbr=on}}

| 2004–2010

| Longest tunnel in India

| Madrid Metro: Line 1

| {{flagicon|Spain}} Madrid, Spain

| {{convert|23876|m|mi|3|abbr=on}}

| 1919–2007

|

| Lainzer/Wienerwaldtunnel

|{{flagicon|Austria}} west of Vienna, Austria

| {{convert|23844|m|mi|3|abbr=on}}

| 2012

| Breakthrough 2007

| Harbour Area Treatment Scheme (HATS) Stage 1{{cite web|url=http://www.gov.hk/en/residents/environment/water/harbourarea.htm|title=GovHK: Harbour Area Treatment Scheme|date=25 November 2015|publisher=Government of Hong Kong|access-date=1 February 2016|archive-url=https://web.archive.org/web/20151230221213/http://www.gov.hk/en/residents/environment/water/harbourarea.htm|archive-date=30 December 2015|url-status=dead}}

| {{flagicon|Hong Kong}} Hong Kong, China (construction started in {{Flagicon|British Hong Kong}} British Hong Kong)

| {{convert|23600|m|mi|3|abbr=on}}

| 2001

|

| Eucumbene-Snowy Tunnel{{cite web|url=http://www.powerhousemuseum.com/hsc/snowy/civil.htm|title=Snowy! Power of a nation|website=Powerhousemuseum.com|access-date=1 February 2016|url-status=dead|archive-url=https://web.archive.org/web/20160303204431/http://www.powerhousemuseum.com/hsc/snowy/civil.htm|archive-date=3 March 2016}}{{Citation | author1=Spooner, William | title=Eucumbene-tumut tunnel ready for service ahead of schedule | date=1959-07-08 | url=https://trove.nla.gov.au/work/195057842 | access-date=16 June 2019 | archive-date=15 May 2023 | archive-url=https://web.archive.org/web/20230515172130/https://trove.nla.gov.au/work/195057842 | url-status=live }}

| {{flagicon|Australia}} New South Wales, Australia

| {{convert|23500|m|mi|3|abbr=on}}

| 1965

| Part of the 145 km tunnel network of the Snowy Mountains Scheme

| South Lüliangshan Tunnel{{cite web |url=http://www.ctg.ha.cn/zjgc/ArticleShow.asp?ArtID=859 |title=Archived copy |access-date=2014-03-23 |url-status=dead |archive-url=https://archive.today/20130721112038/http://www.ctg.ha.cn/zjgc/ArticleShow.asp?ArtID=859 |archive-date=2013-07-21 }}

| {{flagicon|China}} Shanxi, China

| {{convert|23473|m|mi|3|abbr=on}}

| 2014{{cite web |url=http://www.sd.xinhuanet.com/xhsksd/2014-12/30/c_1113832740.htm |title=瓦日铁路（山西中南部铁路通道）30日建成通车_新华网山东频道 |agency=Xinhua News Agency |date=2014-12-30 |access-date=2016-02-01 |url-status=dead |archive-url=https://web.archive.org/web/20160304034657/http://www.sd.xinhuanet.com/xhsksd/2014-12/30/c_1113832740.htm |archive-date=2016-03-04 }}

| 2 tubes, part of Shanxi–Henan–Shandong railway

| Madrid Metro: Line 6

| {{flagicon|Spain}} Madrid, Spain

| {{convert|23472|m|mi|3|abbr=on}}

| 1979–2007

|

| Angrignon – Honoré-Beaugrand (Line 1 Green)

| {{flagicon|Canada}} Montreal Metro, Canada

| {{convert|23262|m|mi|3|abbr=on}}

| 1966–2007

|

| Warsaw Metro Line 1: Kabaty – Młociny

| {{flagicon|Poland}} Warsaw, Poland

| {{convert|23100|m|mi|3|abbr=on}}

| 1983–2008

|

| Beijing Subway: Line 2

| {{flagicon|China}} Beijing, China

| {{convert|23100|m|mi|3|abbr=on}}

| 1969–1987

|

| Xinma Hydroelectric Power Station Water Tunnel

| {{flagicon|China}} Sichuan, China

| {{convert|22975|m|mi|3|abbr=on}}

| 2009

|

| Iiyama Tunnel{{cite web|url=http://en.structurae.de/structures/data/index.cfm?id=s0014094|title=Iiyama Tunnel|work=Structurae|access-date=1 February 2016|archive-date=14 May 2012|archive-url=https://web.archive.org/web/20120514032249/http://en.structurae.de/structures/data/index.cfm?id=s0014094|url-status=live}}

| {{flagicon|Japan}} Iiyama, Japan

| {{convert|22225|m|mi|3|abbr=on}}

| 2015

| Part of the Hokuriku Shinkansen

| Daishimizu Tunnel

| {{flagicon|Japan}} Mount Tanigawa, Japan

| {{convert|22221|m|mi|3|abbr=on}}

| 1982

| Longest railway tunnel until Seikan Tunnel was opened.

| Eucumbene-Tumut Tunnel

| {{flagicon|Australia}} New South Wales, Australia

| {{convert|22200|m|mi|3|abbr=on}}

| 1959

| Part of the 145 km tunnel network of the Snowy Mountains Scheme

|WestConnex

|{{flagicon|Australia}} Sydney, New South Wales, Australia

|{{convert|22000|m|mi|3|abbr=on}}

|2023
(2019–2020 partial completion)

|

| Daegwallyeong Tunnel

| {{flagicon|South Korea}} Pyeongchang–Gangneung (Gyeonggang Line), South Korea

| {{convert|21755|m|mi|3|abbr=on}}

| 2017{{cite web|url=https://www.railjournal.com/regions/asia/korea-opens-ktx-high-speed-line-for-pyeongchang-winter-olympics/|title=Korea opens Olympic high-speed line|date=22 December 2017|website=Railjournal.com|access-date=16 June 2019|archive-date=16 June 2019|archive-url=https://web.archive.org/web/20190616105609/https://www.railjournal.com/regions/asia/korea-opens-ktx-high-speed-line-for-pyeongchang-winter-olympics/|url-status=live}}

|

| Vorotan–Arpa Tunnel{{cite web | url=http://arpa-sevan.am/en/1995-2003-complex-of-hydraulic-structures-for-diversion-of-the-vorotan-river-runoff-to-the-basin-of-the-arpa-river/ | title=1995-2003 "Complex of Hydraulic Structures for Diversion of the Vorotan River Runoff to the Basin of the Arpa River" | Arpa Sevan | access-date=21 January 2022 | archive-date=29 November 2018 | archive-url=https://web.archive.org/web/20181129173353/http://arpa-sevan.am/en/1995-2003-complex-of-hydraulic-structures-for-diversion-of-the-vorotan-river-runoff-to-the-basin-of-the-arpa-river/ | url-status=live }}

| {{flagicon|Armenia}} Armenia (construction started at the time of {{flagicon|USSR}} Soviet Union)

| {{convert|21652|m|mi|3|abbr=on}}

| 2004

|

| UNK proton accelerator

|{{flagicon|Russia}} Protvino, Russia (construction started at the time of {{flagicon|USSR}} Soviet Union)

| {{convert|21000|m|mi|3|abbr=on}}

| 1994 (breakthrough)

| Construction stopped after finishing of main circle tunnel, future is unclear

| Guangfo Metro

| {{flagicon|China}} Foshan, China

|{{convert|20900|m|mi|3|abbr=on}}

| 2010

|

| Luliangshan Tunnel

| {{flagicon|China}} Shanxi, China

| {{convert|20785|m|mi|3|abbr=on}}

| 2011

| 2 tubes: left tube is 20785 meters, right tube is 20738 meters

| Shanghai Subway: Line 4

| {{flagicon|China}} Shanghai, China

| {{convert|20740|m|mi|3|abbr=on}}

| 2005–2007

|

| Barcelona Metro: Line 1

| {{flagicon|Spain}} Barcelona, Spain

| {{convert|20700|m|mi|3|abbr=on}}

| 1926–1992

|

| Ward Tunnel{{Citation needed|date=November 2012}}

| {{flagicon|USA}} California, United States

| {{convert|20610|m|mi|3|abbr=on}}

| 1920–1925

| Part of the Big Creek Hydroelectric Project of the Southern California Edison Company. Excavated through solid granite.

| Busan Metro: Line 1 (Hadan-Busan Nat'l Univ. of Education)

| {{flagicon|South Korea}} Busan, South Korea

| {{convert|20600|m|mi|3|abbr=on}}

| 1985–1994

|

| Xian Subway: Line 2

| {{flagicon|China}} Xi'an, China

| {{convert|20500|m|mi|3|abbr=on}}

| 2011

|

| Daejeon Metro: Line 1

| {{flagicon|South Korea}} Daejeon, South Korea

| {{convert|20470|m|mi|3|abbr=on}}

| 2006–2007

|

| Nanjing Metro Line 2

| {{flagicon|China}} Nanjing, China

| {{convert|20380|m|mi|3|abbr=on}}

| 2010

|

| Shanghai Subway: Line 6

| {{flagicon|China}} Shanghai, China

| {{convert|20336|m|mi|3|abbr=on}}

| 2007

|

| Geumjeong Tunnel{{cite web |url=http://civileng7.tistory.com/1020 |script-title=ko:경부고속철도 금정터널 개요 |date=2009-07-06 |publisher=Civil Engineering |language=ko |access-date=28 August 2010 |archive-date=11 March 2012 |archive-url=https://web.archive.org/web/20120311181626/http://civileng7.tistory.com/1020 |url-status=live }}

| {{flagicon|South Korea}} Busan, South Korea

| {{convert|20323|m|mi|3|abbr=on}}

| 2010

| Gyeongbu high-speed railway

| Wushaoling Tunnel

| {{flagicon|China}} Wuwei, China

| {{convert|20060|m|mi|3|abbr=on}}

| 2006–2007

| 2 tubes: left tube is 20060 meters, right tube is 20050 meters

| Olmos Transandino Project

| {{flagicon|Peru}} Guabal, Peru

| {{convert|20000|m|mi|3|abbr=on}}

| 2011{{cite web|url=http://www.therobbinscompany.com/case-study/olmos/ |title=Olmos Trans-Andean Tunnel |publisher=The Robbins Company |date=2011-12-20 |access-date=2016-02-01}}

|

| Istanbul Metro (Line M5)

| {{flagicon|Turkey}} Istanbul, Turkey

| {{convert|20000|m|mi|3|abbr=on}}

| 2017–2018

| M5 line (Üsküdar-Çekmeköy) is 20 km with depot line. Line is 30.9 km with Çekmeköy-Sultanbeyli Phase.

| The London Connection{{cite web|url=http://www.abb.com/cawp/seitp202/9C1D698E86B2F7ED8025700C00539EFB.aspx|title=ABB starts to make 'The London Connection'|date=2004-08-14|publisher=ABB Group|quote=a 20 km long three-metre diameter tunnel|access-date=8 February 2009|archive-date=5 March 2012|archive-url=https://web.archive.org/web/20120305050156/http://www.abb.com/cawp/seitp202/9C1D698E86B2F7ED8025700C00539EFB.aspx|url-status=live}}

| {{flagicon|United Kingdom}} London, England, United Kingdom

| {{convert|20000|m|mi|3|abbr=on}}

| 2005{{cite web|url=http://www.nationalgrid.com/NR/rdonlyres/DE652156-CC9B-4559-9FA1-40210B4B411C/583/London_Connection_MediaReleasefinal.pdf|title=£200M London Connection Project is Commissioned|date=September 2005|publisher=National Grid plc|access-date=8 February 2009|quote=This 20 km long tunnel contains one of the longest 400 kV XLPE cable circuits to be installed in Europe.|archive-url=https://web.archive.org/web/20100217010641/http://www.nationalgrid.com/NR/rdonlyres/DE652156-CC9B-4559-9FA1-40210B4B411C/583/London_Connection_MediaReleasefinal.pdf|archive-date=17 February 2010|url-status=dead}}

| National Grid plc, 3-metre diameter, 400 kilovolt circuit

| Simplon Tunnel

| {{flagicon|Switzerland}} {{flagicon|Italy}} Lepontine Alps, Switzerland/Italy

| {{convert|19803|m|mi|3|abbr=on}}

| 1906

| Parallel tunnel was opened in 1922 (19,824 m long); longest transit tunnel until Daishimizu Tunnel was opened. Part of the NRLA.

| {{Interlanguage link multi|Mantaro Hydroelectricity Project|es|Central hidroeléctrica del Mantaro}} Tunnel

| {{flagicon|Peru}} Colcabamba, Peru

| {{convert|19800|m|mi|3|abbr=on}}

| 1973{{cite web | url=https://tractebel-engie.com/en/references/mantaro-hydroelectric-complex-modernisation | title=Mantaro Hydroelectric Complex Modernisation }}

|

|Shin Hokuriku Tunnel

|{{flagicon|Japan}} Fukui Prefecture, Japan

|{{convert|19760|m|mi|3|abbr=on}}

|2024

|Part of the Hokuriku Shinkansen

| Follo Line

| {{flagicon|Norway}} Oslo, Norway

| {{convert|19500|m|mi|3|abbr=on}}

| 2022{{Cite web|url=https://www.banenor.no/Prosjekter/prosjekter/follobanen/|title=Follobanen – Bane NOR|access-date=14 October 2020|archive-date=25 July 2021|archive-url=https://web.archive.org/web/20210725193546/https://www.banenor.no/Prosjekter/prosjekter/follobanen/|url-status=live}}{{cite web | url=https://www.tv2.no/nyheter/innenriks/kong-harald-apnet-follobanen/15350032/ | title=Kong Harald åpnet Follobanen | date=12 December 2022 | access-date=4 July 2023 | archive-date=4 October 2023 | archive-url=https://web.archive.org/web/20231004011247/https://www.tv2.no/nyheter/innenriks/kong-harald-apnet-follobanen/15350032/ | url-status=live }}

| Groundbreaking 2014{{cite web|url=https://www.regjeringen.no/no/aktuelt/Follobanen--Nordens-lengste-jernbanetunnel-Samferdselsministeren-fyrte-av-forste-salve/id764206/|title=Follobanen – Nordens lengste jernbanetunnel: Samferdselsministeren fyrte av første salve|last=Samferdselsdepartementet|date=20 June 2014|website=Regjeringen.no|access-date=16 June 2019|archive-date=20 December 2016|archive-url=https://web.archive.org/web/20161220121422/https://www.regjeringen.no/no/aktuelt/Follobanen--Nordens-lengste-jernbanetunnel-Samferdselsministeren-fyrte-av-forste-salve/id764206/|url-status=live}}

| Koltsevaya Line (Circle Line)

| {{flagicon|Russia}} Moscow Metro, Russia (at the time of construction {{flagicon|USSR}} Soviet Union)

| {{convert|19400|m|mi|3|abbr=on}}

| 1950–1954

|

| Futang Hydroelectric Power Station Water Tunnel

| {{flagicon|China}} Sichuan, China

| {{convert|19319|m|mi|3|abbr=on}}

| 2004{{cite web | url=https://www.power-technology.com/marketdata/futang-china/ | title=Futang, China | date=7 December 2021 | access-date=21 January 2022 | archive-date=15 August 2022 | archive-url=https://web.archive.org/web/20220815155829/https://www.power-technology.com/marketdata/futang-china/ | url-status=live }}

|

| Seoul Subway: Bundang Line (Suwon station–Jukjeon station)

| {{flagicon|South Korea}} Yongin and Suwon in South Korea

| {{convert|19300|m|mi|3|abbr=on}}

| 2007–2013

|

| Qamchiq Tunnel{{cite web |url=http://news.xinhuanet.com/english/2016-06/23/c_135458470.htm |title=Chinese, Uzbek leaders hail inauguration of Central Asia's longest railway tunnel – Xinhua | English.news.cn |agency=Xinhua News Agency |access-date=15 January 2022 |archive-url=https://web.archive.org/web/20160623010459/http://news.xinhuanet.com/english/2016-06/23/c_135458470.htm |archive-date=23 June 2016 |url-status=dead}}

| {{flagicon|Uzbekistan}} Angren–Pap railway, Uzbekistan

| {{convert|19200|m|mi|3|abbr=on}}

| 2016

| Longest non-metro railway tunnel in ex-USSR

| North East line

| {{flagicon|Singapore}} MRT, Singapore

| {{convert|19200|m|mi|3|abbr=on}}

| 2003–2011

| World's first fully automated and driverless underground rapid transit line

| Suzhou Metro: Line 2

| {{flagicon|China}} Suzhou, China

| {{convert|19146|m|mi|3|abbr=on}}

| 2009–2012

|

| Maskoŭskaja Line

|{{flagicon|Belarus}} Minsk Metro, Belarus (construction started at the time of {{flagicon|USSR}} Soviet Union)

| {{convert|19100|m|mi|3|abbr=on}}

| 1984–2014

|

| Vereina

| {{flagicon|Switzerland}} Silvretta, Switzerland

| {{convert|19058|m|mi|3|abbr=on}}

| 1999

| Single track with passing loops, metre gauge

| Seoul Subway: Line 4 (Ssangmun–Ichon)

| {{flagicon|South Korea}} Seoul, South Korea

| {{convert|19000|m|mi|3|abbr=on}}

| 1980

|

| Harbour Area Treatment Scheme (HATS) Stage 2{{cite web|url=http://www.epd.gov.hk/eia/register/profile/latest/esb129.pdf#Page=6|title=Project Profile for Harbour Area Treatment Scheme (HATS) Stage 2A|publisher=Government of Hong Kong|access-date=2016-02-01|archive-date=3 January 2016|archive-url=https://web.archive.org/web/20160103082510/http://www.epd.gov.hk/eia/register/profile/latest/esb129.pdf#Page=6|url-status=live}}

| {{flagicon|Hong Kong}} Hong Kong, China

| {{convert|18800|m|mi|3|abbr=on}}

| 2015

|

| Shin-Kanmon Tunnel

| {{flagicon|Japan}} Kanmon Straits, Japan

| {{convert|18713|m|mi|3|abbr=on}}

| 1975

|Part of the San'yō Shinkansen

| Shiziping Hydroelectric Power Station Water Tunnel

| {{flagicon|China}} Sichuan, China

| {{convert|18712|m|mi|3|abbr=on}}

| 2010{{cite web | url=https://www.power-technology.com/marketdata/shiziping-china/ | title=Shiziping, China | date=16 December 2021 | access-date=21 January 2022 | archive-date=15 August 2022 | archive-url=https://web.archive.org/web/20220815151058/https://www.power-technology.com/marketdata/shiziping-china/ | url-status=live }}

|

| Vaglia

| {{flagicon|Italy}} Bologna – Firenze, Italy

| {{convert|18711|m|mi|3|abbr=on}}

| 2009

| Bologna–Florence high-speed railway

| Baoxing Hydroelectric Power Station Water Tunnel

| {{flagicon|China}} Sichuan, China

| {{convert|18676|m|mi|3|abbr=on}}

| 2007

|

| Apennine Base Tunnel

| {{flagicon|Italy}} Tuscan-Emilian Apennines, Italy

| {{convert|18507|m|mi|3|abbr=on}}

| 1934

|

| Obolonsko–Teremkivska line

| {{flagicon|Ukraine}} Kyiv Metro, Ukraine (construction started at the time of {{flagicon|USSR}} Soviet Union)

| {{convert|18480|m|mi|3|abbr=on}}

| 1976–2013

|

| Istanbul Metro (Line M3)

| {{flagicon|Turkey}} Istanbul, Turkey

| {{convert|18460|m|mi|3|abbr=on}}

| 2013–2022

|

| Qinling Tunnel I-II

| {{flagicon|China}} Qin Mountains, China

| {{convert|18460|m|mi|3|abbr=on}}

| 2000

| 2 tubes: left tube is 18460 meters, right tube is 18456 meters{{cite journal|title=Precise leveling of the very long Qinling mountain tunnel| doi=10.1007/BF02826808|volume=3|journal=Geo-spatial Information Science|pages=57–61|year=2000|last1=Zhenglu|first1=Zhang|last2=Zhentao|first2=Yang|last3=Shaquan|first3=Xu|last4=Xiangduo|first4=Zhang| issue=1| bibcode=2000GSIS....3...57Z|doi-access=free}}

| Tatev Hydroelectric Power Station Water Tunnel

| {{flagicon|Armenia}} Armenia (at the time of construction {{flagicon|USSR}} Soviet Union)

| {{convert|18400|m|mi|3|abbr=on}}

| 1970

|

| Yamate Tunnel

| {{flagicon|Japan}} Tokyo, Japan

|

{{convert|18200|m|mi|3|abbr=on}}

| 2015

|

| South Taihangshan Tunnel

| {{flagicon|China}} Shanxi, China

| {{convert|18125|m|mi|3|abbr=on}}

| 2014{{cite web|date=2012-06-18|title=中铁十八局集团中南部铁路通道太行山隧道建设纪实|url=http://www.cr18g.com/a/gb2312/news/qiye/2012/0618/2799.html|url-status=dead|archive-url=https://web.archive.org/web/20160120170640/http://www.cr18g.com/a/gb2312/news/qiye/2012/0618/2799.html|archive-date=2016-01-20|access-date=2016-02-01|website=Cr18g.com}}

| 2 tubes, part of Shanxi–Henan–Shandong railway

| Shanghai Subway: Line 1

| {{flagicon|China}} Shanghai, China

| {{convert|18110|m|mi|3|abbr=on}}

| 1995

|

| Avtozavodskaya Line

| {{flagicon|Belarus}} Minsk Metro, Belarus (construction started at the time of {{flagicon|USSR}} Soviet Union)

| {{convert|18100|m|mi|3|abbr=on}}

| 1990–2005

|

| Zhongnanshan Tunnel

| {{flagicon|China}} Shaanxi, China

| {{convert|18040|m|mi|3|abbr=on}}

| 2007

| The longest road tunnel in China

| Line 2 (Athens Metro){{cite web|url=http://www.amel.gr/index.php?id=22&L=1|title=Urban Rail Transport SA :METRO Line 1|website=Amel.gr|access-date=1 February 2016|archive-date=19 May 2012|archive-url=https://web.archive.org/web/20120519043846/http://www.amel.gr/index.php?id=22&L=1|url-status=live}}

| {{flagicon|Greece}} Athens, Greece

| {{convert|17900|m|mi|3|abbr=on}}

| 1991–2013

|

| Beijing Subway: Line 5

| {{flagicon|China}} Beijing, China

| {{convert|17825|m|mi|3|abbr=on}}

| 2007

|

| Shuakhevi headrace and pressure tunnel

| {{flagicon|Georgia}} Shuakhevi, Adjara, Georgia

| {{convert|17800|m|mi|3|abbr=on}}[http://bankwatch.org/sites/default/files/briefing-ShuakheviHPP-Georgia-2May2014.pdf The Shuakhevi hydropower plant project, Georgia] {{Webarchive|url=https://web.archive.org/web/20140728052143/http://bankwatch.org/sites/default/files/briefing-ShuakheviHPP-Georgia-2May2014.pdf |date=28 July 2014 }}

| 2013–2017

|

| Ankara Metro (AKM-Koru)

| {{flagicon|Turkey}} Ankara, Turkey

| {{convert|19660|m|mi|3|abbr=on}}

| 1997–2014

| M1 line is tunnel in Kızılay between AKM, M2 line is completely underground.

| Jingpingshan

| {{flagicon|China}} Sichuan, China

| {{convert|17500|m|mi|3|abbr=on}}

| 2008

| The deepest transportation tunnel in China

| Shenzhen Subway: Longgang Line

| {{flagicon|China}} Shenzhen, China

| {{convert|17333|m|mi|3|abbr=on}}

| 2010–2011

|

| Kholodnohirsko–Zavodska Line

|{{flagicon|Ukraine}} Kharkiv Metro, Ukraine (at the time of construction {{flagicon|USSR}} Soviet Union)

| {{convert|17300|m|mi|3|abbr=on}}

| 1975–1978

|

| Seoul Subway: Shinbundang Line

| {{flagicon|South Korea}} Seoul and Seongnam in South Korea

| {{convert|17300|m|mi|3|abbr=on}}

| 2011

|

| Mavi Tünel (Blue Tunnel){{cite web|url=http://www.mavitunel.com/ |title=Bağbaşı Barajı ve Mavi Tünel'i İnşaatı – Konya |website=Mavitunel.com |access-date=2016-02-01 |url-status=dead |archive-url=https://web.archive.org/web/20160129085315/http://www.mavitunel.com/ |archive-date=29 January 2016 }}

|{{flagicon|Turkey}} Konya, Turkey

| {{convert|17034|m|mi|3|abbr=on}}

| 2012

| Breakthrough 2007

| Gotthard Road Tunnel

| {{flagicon|Switzerland}} Lepontine Alps, Switzerland

| {{convert|16918|m|mi|3|abbr=on}}

| 1980

|

| Guangzhou Metro: Line 4

| {{flagicon|China}} Guangzhou, China

| {{convert|16790|m|mi|3|abbr=on}}

| 2005

|

| İzmir Metro Line M1

| {{flagicon|Turkey}} İzmir, Turkey

| {{convert|16750|m|mi|3|abbr=on}}

| 2000–2023

|

| Barcelona Metro: Line 4

| {{flagicon|Spain}} Barcelona, Spain

| {{convert|16700|m|mi|3|abbr=on}}

| 1929–1999

|

| Seoul Subway: Line 2 (Jamsil–Sillim)

| {{flagicon|South Korea}} Seoul, South Korea

| {{convert|16700|m|mi|3|abbr=on}}

| 1980–1984

|

| Barcelona Metro: Line 3

| {{flagicon|Spain}} Barcelona, Spain

| {{convert|16600|m|mi|3|abbr=on}}

| 1924–2001

|

| Barcelona Metro: Line 5

| {{flagicon|Spain}} Barcelona, Spain

| {{convert|16600|m|mi|3|abbr=on}}

| 1959–1983

|

| Murrumbidgee-Eucumbene Tunnel

| {{flagicon|Australia}} New South Wales, Australia

| {{convert|16600|m|mi|3|abbr=on}}

| 1961

| Part of the 145 km tunnel network of the Snowy Mountains Scheme

| Istanbul Metro (Line M2)

| {{flagicon|Turkey}} Istanbul, Turkey

| {{convert|16500|m|mi|3|abbr=on}}

| 2000–2009

|

| Beijing Subway: Line 9

| {{flagicon|China}} Beijing, China

| {{convert|16500|m|mi|3|abbr=on}}

| 2011–2012

|

| Jinkang Hydroelectric Power Station Water Tunnel

| {{flagicon|China}} Sichuan, China

| {{convert|16490|m|mi|3|abbr=on}}

| 2006

|

| Madrid Metro: Line 8

| {{flagicon|Spain}} Madrid, Spain

| {{convert|16467|m|mi|3|abbr=on}}

| 1998–2007

|

| Guangzhou Metro: Line 1

| {{flagicon|China}} Guangzhou, China

| {{convert|16449|m|mi|3|abbr=on}}

| 1997

|

| Madrid Metro: Line 3

| {{flagicon|Spain}} Madrid, Spain

| {{convert|16424|m|mi|3|abbr=on}}

| 1939–2007

|

| Rokkō Tunnel{{cite web|url=http://www.japan-tunnel.org/nttj/statistical_data/index2.html|title=New Tunneling Technology in Japan / Statistical Data|publisher=Japan-tunnel.org|access-date=1 February 2016|archive-url=https://web.archive.org/web/20160115174556/http://www.japan-tunnel.org/nttj/statistical_data/index2.html|archive-date=15 January 2016|url-status=dead}}

| {{flagicon|Japan}} Mount Rokkō, Japan

| {{convert|16250|m|mi|3|abbr=on}}

| 1972

|Part of the San'yō Shinkansen

| Solan Tunnel{{cite web |script-title=ko:대우건설 솔안터널 관통식 |url=http://www.asiaeconomy.co.kr/uhtml/read.php?idxno=2006120711251167615 |language=ko |publisher=Asia Economy |date=2006-12-07 |access-date=6 October 2008 |archive-date=23 July 2012 |archive-url=https://web.archive.org/web/20120723032032/http://www.asiae.co.kr/uhtml/read.php?idxno=2006120711251167615 |url-status=dead }}

|{{flagicon|South Korea}} Taebaek, Gangwon-do, South Korea

| {{convert|16240|m|mi|3|abbr=on}}

| 2012

| Taebaek Line, includes a spiral

| Kemano T1 and T2{{Cite web|url=https://www.researchgate.net/figure/Plan-view-of-Kemano-T1-and-T2-tunnels-Morgenroth-2016_fig1_337086338|title=Plan view of Kemano T1 and T2 tunnels (Morgenroth, 2016). | Download Scientific Diagram|access-date=28 March 2023|archive-date=28 March 2023|archive-url=https://web.archive.org/web/20230328155153/https://www.researchgate.net/figure/Plan-view-of-Kemano-T1-and-T2-tunnels-Morgenroth-2016_fig1_337086338|url-status=live}}

| {{flagicon|Canada}} Kemano, Canada

| {{convert|16000|m|mi|3|abbr=on}}

| 1954; 2022

| T1 was completed in 1954 and T2 was completed in May, 2022,{{Cite web |title=Rio Tinto completes Kemano hydropower project |url=https://www.riotinto.com/en/news/releases/2022/rio-tinto-completes-kemano-hydropower-project |access-date=2023-03-28 |website=riotinto.com |language=en |archive-date=28 March 2023 |archive-url=https://web.archive.org/web/20230328155153/https://www.riotinto.com/en/news/releases/2022/rio-tinto-completes-kemano-hydropower-project |url-status=live }} both are in operation.

| Seoul Subway: Line 7 (Suraksan–Konkuk University)

| {{flagicon|South Korea}} Seoul, South Korea

| {{convert|16000|m|mi|3|abbr=on}}

| 1996

|

| {{Interlanguage link multi|Münsterertunnel|de|Münsterertunnel}}

|{{flagicon|Austria}} Tyrol, Austria

| {{convert|15990|m|mi|3|abbr=on}}

| 2012

|

| Xiangshan Tunnel 象山隧道

| {{flagicon|China}} Fujian, China

| {{convert|15917|m|mi|3|abbr=on}}

| 2012

| 2 tubes, part of Longyan–Xiamen Railway

| {{Interlanguage link multi|Terfnertunnel|de|Terfener Tunnel}}

| {{flagicon|Austria}} Tyrol, Austria

| {{convert|15840|m|mi|3|abbr=on}}

| 2012

|

| Henderson Tunnel{{cite web |url=http://www.climaxmolybdenum.com/WorldwideLocations/USA_Colorado_Henderson.htm |title=Climax Molybdenum – A Freeport-McMoRan Company|website=climaxmolybdenum.com |archive-url=https://web.archive.org/web/20140630180945/http://www.climaxmolybdenum.com/WorldwideLocations/USA_Colorado_Henderson.htm |archive-date=30 June 2014}}{{cite web |url=http://www.robl.w1.com/Transport/tunnel.htm |title= Longest Railroad Tunnels|website=robl.w1.com |archive-url=https://web.archive.org/web/20120526160741/http://www.robl.w1.com/Transport/tunnel.htm |archive-date=26 May 2012}}

| {{flagicon|United States}} Front Range, United States

| {{convert|15800|m|mi|3|abbr=on}}

| 1976

| Narrow gauge railway, replaced by a conveyor belt in 1999. Only one portal (served an underground mine){{cite web|url=http://www.transportwriter.com/writings/writing4_minetram.htm|title=Transport Writer|website=Transportwriter.com|access-date=1 February 2016|archive-date=4 March 2016|archive-url=https://web.archive.org/web/20160304040706/http://www.transportwriter.com/writings/writing4_minetram.htm|url-status=dead}}

| Istanbul Metro (Line M9)

| {{flagicon|Turkey}} Istanbul, Turkey

| {{convert|15800|m|mi|3|abbr=on}}

| 2013–2024

|

| Pandaoling Tunnel, Datong River Diversion to Shaanxi Project

| {{flagicon|China}} Shaanxi, China

| {{convert|15723|m|mi|3|abbr=on}}

| 1994

|

| Copenhagen Metro: City Circle Line

| {{flagicon|Denmark}} Denmark

| {{convert|15500|m|mi|3|abbr=on}}

| 2019

| Longest railway tunnel in Denmark and Scandinavia

| Budapest Metro: Line 3{{cite web|title=3-as metróvonal jellemzői|url=http://metros.hu/vonal/jellemzok_m3.html|website=Metros.hu|access-date=27 March 2016|language=hu|archive-date=10 February 2024|archive-url=https://web.archive.org/web/20240210001223/http://metros.hu/vonal/jellemzok_m3.html|url-status=live}}

| {{flagicon|Hungary}} Hungary

| {{convert|15500|m|mi|3|abbr=on}}

| 1976–1990

| Line 3 is actually 17.39 km long, but only 15.5 km of it is underground.

| Furka Base

| {{flagicon|Switzerland}} Urner Alps, Switzerland

| {{convert|15442|m|mi|3|abbr=on}}

| 1982

| Single track with passing loops, metre gauge

| Ceneri Base Tunnel

| {{flagicon|Switzerland}} Lepontine Alps, Switzerland

| {{convert|15400|m|mi|3|abbr=on}}

| 2020

| Part of the NRLA

| Seoul Subway: Line 3 (Gupabal–Geumho)

| {{flagicon|South Korea}} Seoul, South Korea

| {{convert|15400|m|mi|3|abbr=on}}

| 1985

|

| Tianjin Subway: Line 1

| {{flagicon|China}} Tianjin, China

| {{convert|15378|m|mi|3|abbr=on}}

| 1976–2006

|

| Haruna Tunnel

| {{flagicon|Japan}} Gunma Prefecture, Japan

| {{convert|15350|m|mi|3|abbr=on}}

| 1982

|Part of the Jōetsu Shinkansen

| Severomuysky Tunnel

| {{flagicon|Russia}} Severomuysky Range, Russia (construction started at the time of {{flagicon|USSR}} Soviet Union)

| {{convert|15343|m|mi|3|abbr=on}}

| 2003

|

| Deer Island Outfall Tunnel{{cite web | pages = 3-5, 3-9 | url = http://www.mwra.com/publications/masterplan/2006/wastewater.pdf | title = Wastewater Master Plan | author = Massachusetts Water Resources Authority | date = December 2006 | author-link = Massachusetts Water Resources Authority | access-date = 7 July 2013 | archive-date = 8 August 2012 | archive-url = https://web.archive.org/web/20120808130735/http://www.mwra.com/publications/masterplan/2006/wastewater.pdf | url-status = live }}

| {{flagicon|United States}} Deer Island, Boston, Massachusetts, United States

| {{convert|15290|m|mi|3|abbr=on}}

| 2000

| {{convert|24|ft|m|1|abbr=on}} diameter (42m² cross section); discharges treated effluent into Atlantic Ocean

| Firenzuola

| {{flagicon|Italy}} Bologna – Firenze, Italy

| {{convert|15285|m|mi|3|abbr=on}}

| 2009

| Bologna–Florence high-speed railway

| Inguri Hydroelectric Power Station Water Tunnel

| {{flagicon|Georgia}} Georgia (at the time of construction {{flagicon|USSR}} Soviet Union)

| {{convert|15279|m|mi|3|abbr=on}}

| 1978

|

| Shanghai Subway: Line 2

| {{flagicon|China}} Shanghai, China

| {{convert|15274|m|mi|3|abbr=on}}

| 2000

| Between Zhanjianggaoke station and Lingkong Station

| Jinquidi Tunnel, Niulan River Diversion to Dianchi

| {{flagicon|China}} Yunnan, China

| {{convert|15257|m|mi|3|abbr=on}}

| 2013

|

| Baotan Hydroelectric Power Station Water Tunnel

| {{flagicon|China}} Guangxi, China

| {{convert|15200|m|mi|3|abbr=on}}

| 2010

|

| Gorigamine Tunnel

| {{flagicon|Japan}} Nagano Prefecture, Japan

| {{convert|15175|m|mi|3|abbr=on}}

| 1997

|Part of the Hokuriku Shinkansen

| Xuecheng Hydroelectric Power Station Water Tunnelhttp://cdm.unfccc.int/filestorage/z/4/R0BX9WPCSNKHQVUTI37E24A8YOZM16.pdf/Sichuan%20Xuecheng%20Hydropower%20Project%28clear%20version%29%20.pdf?t=Mnh8bnQ1N2NofDDMMDpZU98Wvug0iq9fFgy2 {{dead link|date=June 2016|bot=medic}}{{cbignore|bot=medic}}

| {{flagicon|China}} Sichuan, China

| {{convert|15174|m|mi|3|abbr=on}}

| 2007

|

| Monte Santomarco

| {{flagicon|Italy}} Paola – Cosenza, Italy

| {{convert|15040|m|mi|3|abbr=on}}

| 1987

|

| Gotthard Rail Tunnel

| {{flagicon|Switzerland}} Lepontine Alps, Switzerland

| {{convert|15003|m|mi|3|abbr=on}}

| 1882

| Longest transit tunnel until Simplon Tunnel was opened.

| Gwangju Metro: Line 1 (Sotae station–Dosan station)

| {{flagicon|South Korea}} Gwangju, South Korea

| {{convert|15000|m|mi|3|abbr=on}}

| 2004

|

| Nakayama Tunnel

| {{flagicon|Japan}} Gunma Prefecture, Japan

| {{convert|14857|m|mi|3|abbr=on}}

| 1982

| Part of the Jōetsu Shinkansen

| Dangara Irrigation Tunnel{{cite web |url=http://www.gidrospetsproekt.ru/en/geografiya-obektov/image-map_rossija/tadzhikistan/dangarinskij-gidrotexnicheskij-tonnel.html |title=Р"идроспецпроекС'/Dangarinsky Hydrotechnical tunnel in Tajikistan |website=Gidrospetsproekt.ru |access-date=2016-02-01 |archive-date=1 July 2015 |archive-url=https://web.archive.org/web/20150701170627/http://www.gidrospetsproekt.ru/en/geografiya-obektov/image-map_rossija/tadzhikistan/dangarinskij-gidrotexnicheskij-tonnel.html |url-status=live }}

| {{flagicon|Tajikistan}} Nurek, Tajikistan (at the time of construction {{flagicon|USSR}} Soviet Union)

| {{convert|14800|m|mi|3|abbr=on}}

| 1987

|

| Cuajone-El Sargento

| {{flagicon|Peru}} Ilo-Toquepala / Cuajone Industrial Railroad – Southern Peru Copper Corporation, Peru

| {{convert|14724|m|mi|3|abbr=on}}{{cite web|url=http://www.railpictures.net/photo/343052/|title=RailPictures.Net Photo: SPCC 41 Southern Peru Copper Corporation GE U23B at Toquepala, Peru by Jean-Marc Frybourg|website=Railpictures.net|access-date=1 February 2016|archive-date=8 October 2018|archive-url=https://web.archive.org/web/20181008174916/http://www.railpictures.net/photo/343052/|url-status=live}}

| 1975

|

| Mount Macdonald Tunnel

| {{flagicon|Canada}} Rogers Pass, Glacier National Park, Canada

| {{convert|14723|m|mi|3|abbr=on}}

| 1989

|

| Misaka Sasago Tunnel

| {{flagicon|Japan}} Yamanashi, Japan

| {{convert|14613|m|mi|3|abbr=on}}

| 1996

| Part of the Chuo Shinkansen (Maglev). Already used as Yamanashi Test Track since 1996.

| Lötschberg Tunnel

| {{flagicon|Switzerland}} Bernese Alps, Switzerland

| {{convert|14612|m|mi|3|abbr=on}}

| 1913

|

| Caoe River Diversion Project

| {{flagicon|China}} Zhejiang, China

| {{convert|14600|m|mi|3|abbr=on}}

| 2011

|

| Romerike Tunnel

| {{flagicon|Norway}} Oslo – Lillestrøm, Norway

| {{convert|14580|m|mi|3|abbr=on}}

| 1999

|

| Fajiushan Tunnel{{cite web |url=http://finance.china.com.cn/roll/20130919/1824721.shtml |title=山西中南部铁路通道发鸠山隧道贯通 |publisher=中国网 |date=2013-09-19 |author=李连明 谢崇志 王瑞晨 |access-date=26 December 2022 |archive-date=10 May 2019 |archive-url=https://web.archive.org/web/20190510151447/http://finance.china.com.cn/roll/20130919/1824721.shtml |url-status=live }}

| {{flagicon|China}} Shanxi, China

| {{convert|14573|m|mi|3|abbr=on}}

| 2014

| Part of Shanxi–Henan–Shandong railway.

| Snowy-Geehi Tunnel

|{{flagicon|Australia}} New South Wales, Australia

| {{convert|14500|m|mi|3|abbr=on}}

| 1966

| Part of the 145 km tunnel network of the Snowy Mountains Scheme

| Seoul Subway: Line 4 (Isu–Beomgye)

| {{flagicon|South Korea}} Seoul, Gwacheon and Anyang in South Korea

| {{convert|14500|m|mi|3|abbr=on}}

| 1980–1994

|

| Zigana Tunnel

| {{flagicon|Turkey}} Torul–Maçka, Turkey

| {{convert|14481|m|mi|3|abbr=on}}{{cite web|url=https://www.haberler.com/yeni-zigana-tuneli-insaati-devam-ediyor-8707292-haberi/|title=Yeni Zigana Tüneli İnşaatı Devam Ediyor|website=Haberler.com|date=17 August 2016|access-date=16 June 2019|archive-date=16 June 2019|archive-url=https://web.archive.org/web/20190616105616/https://www.haberler.com/yeni-zigana-tuneli-insaati-devam-ediyor-8707292-haberi/|url-status=live}}

| 2023{{cite web | url=https://www.trthaber.com/haber/gundem/cumhurbaskani-erdogandan-tesekkurler-rize-paylasimi-764619.html | title=Cumhurbaşkanı Erdoğan'dan 'Teşekkürler Rize' paylaşımı | date=3 May 2023 | access-date=4 July 2023 | archive-date=3 May 2023 | archive-url=https://web.archive.org/web/20230503170740/https://www.trthaber.com/haber/gundem/yeni-zigana-tuneli-acildi-764621.html | url-status=live }}

| Longest road tunnel in Turkey

| Jisha Hydroelectric Power Station Water Tunnel

| {{flagicon|China}} Yunnan, China

| {{convert|14467|m|mi|3|abbr=on}}

| 2007

|

| Ryfylke Tunnel

| {{flagicon|Norway}} Stavanger–Strand, Norway

| {{convert|14400|m|mi|3|abbr=on}}

| 2019

| Longest underwater road tunnel in the world

| #6 Tunnel, Yellow River Diversion to Shanxi South Line

| {{flagicon|China}} Shanxi, China

| {{convert|14400|m|mi|3|abbr=on}}

| 2002

| See South–North Water Transfer Project

| Ala Mountain Pass Water Supply Project

| {{flagicon|China}} Xinjiang, China

| {{convert|14346|m|mi|3|abbr=on}}

| 2010

|

| Ovit Tunnel{{cite news |url=http://www.hurriyet.com.tr/gundem/20546715.asp |newspaper=Hürriyet Daily News |title=Başbakan Ovit Dağı Tüneli'nin temelini attı |author=Kaçar, Muhammet |date=2012-05-13 |language=tr |access-date=13 May 2012 |archive-date=16 May 2012 |archive-url=https://web.archive.org/web/20120516020002/http://www.hurriyet.com.tr/gundem/20546715.asp |url-status=live }}

| {{flagicon|Turkey}} Erzurum Province–Rize Province, Turkey

| {{convert|14346|m|mi|3|abbr=on}}

| 2018

|

| Stockholm Metro: Tunnelbana 3 (Blue Line) Kungsträdgården–Hjulsta

| {{flagicon|Sweden}} Stockholm, Sweden

| {{convert|14300|m|mi|3|abbr=on}}

| 1975–1977

|

| Dayaoshan Tunnel{{cite web|url=http://www.ita-aites.org/cms/564.html|title=2010 – Activity Report – ITA-AITES|website=Ita-aites.org|access-date=1 February 2016|url-status=dead|archive-url=https://web.archive.org/web/20080619151552/http://www.ita-aites.org/cms/564.html|archive-date=19 June 2008}}

| {{flagicon|China}} Nanling Mountains, China

| {{convert|14294|m|mi|3|abbr=on}}

| 1987

|

| Istanbul Metro (Line M8)

| {{flagicon|Turkey}} Istanbul, Turkey

| {{convert|14270|m|mi|3|abbr=on}}

| 2023{{cite web | url=https://www.ntv.com.tr/turkiye/bostanci-dudullu-metrosu-ne-zaman-acilacak-iste-bostanci-dudullu-metro-duraklari-guzergahlari,89GrvJ0-ZkuW7uHj6nUgWg | title=M8 Bostancı-Dudullu Metro Hattı'nın açılışı yapıldı (Yeni metro hattının durakları ve güzergahı) | access-date=4 July 2023 | archive-date=21 January 2023 | archive-url=https://web.archive.org/web/20230121052630/https://www.ntv.com.tr/turkiye/bostanci-dudullu-metrosu-ne-zaman-acilacak-iste-bostanci-dudullu-metro-duraklari-guzergahlari,89GrvJ0-ZkuW7uHj6nUgWg | url-status=live }}

|

| Zaramag Hydroelectric Power Station Water Tunnel{{cite web|url=http://www.lhp.rushydro.ru/company/objectsmap/5730.html|title=Гидроузел на р. Ардон|website=Lhp.rushydro.ru|access-date=1 February 2016|archive-date=14 August 2012|archive-url=https://web.archive.org/web/20120814135012/http://www.lhp.rushydro.ru/company/objectsmap/5730.html|url-status=dead}}{{cite web|url=http://www.zaramag.rushydro.ru/hpp/general/|title=Общие сведения|website=Zaramag.rushydro.ru|access-date=1 February 2016|archive-date=20 May 2013|archive-url=https://web.archive.org/web/20130520063847/http://www.zaramag.rushydro.ru/hpp/general|url-status=dead}}

| {{flagicon|Russia}} Ardon River, North Ossetia, Russia

| {{convert|14226|m|mi|3|abbr=on}}

| 2015{{cite web|url=http://blog.rushydro.ru/?p=10068|title=Зарамагский тоннель – Блог РусГидро|website=Blog.rushydro.ru|access-date=16 June 2019|archive-date=15 February 2016|archive-url=https://web.archive.org/web/20160215174147/http://blog.rushydro.ru/?p=10068|url-status=dead}}

|

| Tooma-Tumut Tunnel

| {{flagicon|Australia}} New South Wales, Australia

| {{convert|14200|m|mi|3|abbr=on}}

| 1961

| Part of the 145 km tunnel network of the Snowy Mountains Scheme

| Metro Lisbon – Blue (Seagull) Line

| {{flagicon|Portugal}} Lisbon, Portugal

| {{convert|14000|m|mi|3|abbr=on}}

| 1959–2007

|

| MTR – Island line (West of Heng Fa Chuen)

| {{flagicon|Hong Kong}} Hong Kong, China (construction started at the time of {{Flagicon|British Hong Kong}} British Hong Kong)

| {{convert|14000|m|mi|3|abbr=on}}

| 1985–2014

|

| Arlberg Road Tunnel

| {{flagicon|Austria}} Arlberg, Austria

| {{convert|13972|m|mi|3|abbr=on}}

| 1978

|

| Shanggongshan Tunnel, Zhangjiuhe Water Supply Project

|{{flagicon|China}} Yunnan, China

| {{convert|13941|m|mi|3|abbr=on}}

| 2007

|

| Dayingshan #4 Hydroelectric Power Station Water Tunnel

| {{flagicon|China}} Yunnan, China

| {{convert|13932|m|mi|3|abbr=on}}

| 2009

| 8.5 m in diameter (57m² cross section)

| Hokuriku Tunnel

| {{flagicon|Japan}} Fukui Prefecture, Japan

| {{convert|13870|m|mi|3|abbr=on}}

| 1962

| Part of the Hokuriku Main Line

| Xiapu Tunnel

| {{flagicon|China}} Fujian, China

| {{convert|13838|m|mi|3|abbr=on}}

| 2009

|

| Yesanguan Tunnel

| {{flagicon|China}} Hubei, China

| {{convert|13838|m|mi|3|abbr=on}}

| 2010

| Tube I: 13838 meters, tube II: 13796 meters

| Centrala Hidroelectrică Lotru-Ciunget

| {{flagicon|Romania}} Ciungetu, Romania

| {{convert|13719|m|mi|3|abbr=on}}

| 1972

| 5 m in diameter

| Fréjus (Mont Cenis)

|{{flagicon|France}} {{flagicon|Italy}} Alps, France/Italy (construction started in the Kingdom of Sardinia)

| {{convert|13657|m|mi|3|abbr=on}}

| 1871

| Longest transit tunnel until Gotthard Tunnel was opened.

| Xishan Tunnel

| {{flagicon|China}} Shanxi, China

| {{convert|13654|m|mi|3|abbr=on}}

| 2012

| Left tube: 13654 meters, right tube: 13570 meters

| North Tianshan Tunnel

| {{flagicon|China}} Xinjiang, China

| {{convert|13610|m|mi|3|abbr=on}}

| 2009

|

| Marmaray

| {{flagicon|Turkey}} Istanbul, Turkey

| {{convert|13600|m|mi|3|abbr=on}}

| 2013

| Built next to a fault zone, between two continents

| Savio Rail Tunnel

| {{flagicon|Finland}} Helsinki – Kerava, Finland

| {{convert|13575|m|mi|3|abbr=on}}

| 2008

|

| Busan Metro: Line 3 (Suyeong–Deokcheon)

| {{flagicon|South Korea}} Busan, South Korea

| {{convert|13500|m|mi|3|abbr=on}}

| 2005

|

| Shin Shimizu Tunnel

| {{flagicon|Japan}} Mount Tanigawa, Japan

| {{convert|13500|m|mi|3|abbr=on}}

| 1967

|Part of the Jōetsu Line

| Mount Erlang Tunnel

| {{flagicon|China}} Sichuan, China

| {{convert|13433|m|mi|3|abbr=on}}

| 2018

| Erlangshan extra-long tunnel part of Yakang Expressway

| Hex River Tunnel{{cite web |url=http://www.britannica.com/eb/table?tocId=9438409&idxStructId=105759&typeId= |title= Britannica Online Encyclopedia|website=Encyclopædia Britannica |archive-url=https://web.archive.org/web/20080225190827/http://www.britannica.com/eb/table?tocId=9438409&idxStructId=105759&typeId= |archive-date=25 February 2008}}

| {{flagicon|South Africa}} Hex River Pass, South Africa

| {{convert|13400|m|mi|3|abbr=on}}

| 1989

|

| Wonhyo Tunnel{{cite web |url=http://lib.semi.ac.cn:8080/tsh/dzzy/wsqk/spie/vol7292/72923g.pdf |title=Measurement of compressive and tensile strain in the railway structures with FBG sensor packages |website=lib.semi.ac.cn:8080 |archive-url=https://web.archive.org/web/20120302104804/http://lib.semi.ac.cn:8080/tsh/dzzy/wsqk/spie/vol7292/72923g.pdf |archive-date=2 March 2012}}{{cite web |url=http://www.ita-aites.org/cms/fileadmin/filemounts/general/pdf/ItaAssociation/ProductAndPublication/OpenSession/OS_2006_4SKE-C.pdf |title= |website=ita-aites.org |archive-url=https://web.archive.org/web/20090109051907/http://www.ita-aites.org/cms/fileadmin/filemounts/general/pdf/ItaAssociation/ProductAndPublication/OpenSession/OS_2006_4SKE-C.pdf |archive-date=9 January 2009}}

|{{flagicon|South Korea}} Ulsan, South Korea

| {{convert|13270|m|mi|3|abbr=on}}

| 2010

| Gyeongbu high-speed railway

| Dabieshan Tunnel

| {{flagicon|China}} Hubei, China

| {{convert|13256|m|mi|3|abbr=on}}

| 2008

|

| Schlern Tunnel{{cite web |url=http://www.bbt-se.com/index.php?option=com_content&task=view&id=124&Itemid=140&lang=en |title= BBT SE|website=bbt-se.com |archive-url=https://web.archive.org/web/20110910043534/http://www.bbt-se.com/index.php?option=com_content&task=view&id=124&Itemid=140&lang=en |archive-date=10 September 2011}}

|{{flagicon|Italy}} South Tyrol, Italy

| {{convert|13159|m|mi|3|abbr=on}}

| 1993

|

| Caponero-Capoverde

| {{flagicon|Italy}} Genova – Ventimiglia, Italy

| {{convert|13135|m|mi|3|abbr=on}}

| 2001

| Includes an underground station ("San Remo")

| Hongtiguan Tunnel

| {{flagicon|China}} Shanxi, China

| {{convert|13122|m|mi|3|abbr=on}}

| 2013

| Left tube: 13122 meters, right tube: 13098 meters

| Barcelona Metro line 2

| {{flagicon|Spain}} Barcelona, Spain

| {{convert|13100|m|mi|3|abbr=on}}

| 1985–1997

|

| Aki Tunnel

|{{flagicon|Japan}} Hiroshima Prefecture, Japan

| {{convert|13030|m|mi|3|abbr=on}}

| 1975

|Part of the San'yō Shinkansen

| Kashuang Water Tunnel

| {{flagicon|China}} Xinjiang, China

| {{convert|280000|m|mi|3|abbr=on}}

| (??)

| Water transfer from the snow melt of Altai Mountains to the arid region of Xinjiang{{Cite web|date=2021-12-18|title=Chinese engineers digging giant desert tunnel never saw this coming|url=https://www.scmp.com/news/china/science/article/3160185/chinese-engineers-digging-worlds-longest-tunnel-xinjiang-desert|access-date=2021-12-21|website=South China Morning Post|language=en|archive-date=21 December 2021|archive-url=https://web.archive.org/web/20211221123626/https://www.scmp.com/news/china/science/article/3160185/chinese-engineers-digging-worlds-longest-tunnel-xinjiang-desert|url-status=live}}

| New York City Water Tunnel No. 3

| {{flagicon|USA}} New York State, United States

| {{convert|96560|m|mi|3|abbr=on}}

| 2032{{cite web | url=https://gothamist.com/news/nycs-giant-water-tunnel-begins-work-on-final-shafts-following-50-years-of-construction | title=NYC's Giant Water Tunnel Begins Work on Final Shafts, Following 50 Years of Construction | date=22 April 2021 | access-date=22 January 2022 | archive-date=22 January 2022 | archive-url=https://web.archive.org/web/20220122003757/https://gothamist.com/news/nycs-giant-water-tunnel-begins-work-on-final-shafts-following-50-years-of-construction | url-status=live }}

| More water supply for New York City. Partially in use.

| Paris Métro Line 15

| {{flagicon|France}} Paris/Île-de-France, France

| {{convert|75000|m|mi|3|abbr=on}}

| 2025–2030

| Circular line

|Xianglushan Tunnel

|{{flagicon|China}} Yunnan, China

|{{convert|62596|m|mi|3|abbr=on}}

|2026

|Longest tunnel of the Central Yunnan Water Diversion Project{{Cite web |title=62.596Km，这里有最陡的斜井！走进滇中引水最长深埋隧洞"香炉山"-思茅网 |url=https://www.simaowang.com/zx_nr.asp?id=23106 |access-date=2024-11-20 |website=www.simaowang.com}}

| Mont d'Ambin Base Tunnel

| {{flagicon|France}} {{flagicon|Italy}} Cottian Alps, France/Italy

| {{convert|57500|m|mi|3|abbr=on}}

| 2032{{cite web | url=https://www.ledauphine.com/economie/2021/07/07/les-marches-du-tunnel-de-base-du-lyon-turin-attribues | title=France / Italie. Lyon-Turin : Les marchés du tunnel de base attribués | date=7 July 2021 | access-date=22 January 2022 | archive-date=9 March 2022 | archive-url=https://web.archive.org/web/20220309050245/https://www.ledauphine.com/economie/2021/07/07/les-marches-du-tunnel-de-base-du-lyon-turin-attribues | url-status=live }}

| Part of the Lyon–Turin high-speed railway. Reconnaissance tunnels under construction since 2002; construction of main tunnel started in 2016.{{cite web | url=https://www.telt-sas.com/en/chronology-of-works/ | title=TELT Lyon Turin • Chronology of works | access-date=17 October 2020 | archive-date=17 October 2020 | archive-url=https://web.archive.org/web/20201017095155/https://www.telt-sas.com/en/chronology-of-works/ | url-status=live }}

| Brenner Base Tunnel

| {{flagicon|Austria}} {{flagicon|Italy}} Stubai Alps, Austria/Italy

| {{convert|55000|m|mi|3|abbr=on}}

| 2032{{cite web | url=https://kurier.at/wirtschaft/inbetriebnahme-des-brennerbasistunnels-voraussichtlich-erst-2032/401388909 | title=Inbetriebnahme des Brennerbasistunnels voraussichtlich erst 2032 | date=21 May 2021 | access-date=25 July 2023 | archive-date=6 April 2023 | archive-url=https://web.archive.org/web/20230406214712/https://kurier.at/wirtschaft/inbetriebnahme-des-brennerbasistunnels-voraussichtlich-erst-2032/401388909 | url-status=live }}

| Construction started in March 2015. Together with the already constructed Inntal Tunnel it will form the world's longest continuous railway tunnel with 64 km.{{cite web|url=http://www.bbt-se.com/en/did-you-know/ |title=Did you know … |website=BBT-SE.com |access-date=2016-02-01 |url-status=dead |archive-url=https://web.archive.org/web/20160202005914/http://www.bbt-se.com/en/did-you-know/ |archive-date=2 February 2016 }}{{cite web | url=https://www.tunnel-online.info/en/artikel/tunnel_Start_of_works_on_the_main_tunnel_2323530.html | title=BBT: Start of Works on the main Tunnel – tunnel | access-date=7 December 2019 | archive-date=31 October 2020 | archive-url=https://web.archive.org/web/20201031081602/https://www.tunnel-online.info/en/artikel/tunnel_Start_of_works_on_the_main_tunnel_2323530.html | url-status=live }}

| Thomson–East Coast Line

| {{flagicon|Singapore}} MRT, Singapore

| {{convert|43000|m|mi|3|abbr=on}}

| 2024

| Excluding planned extension

| Yigong tunnel

| {{flagicon|China}} Tibet, China

| {{convert|42500|m|mi|3|abbr=on}}{{Cite web |title=川藏铁路雅安至林芝段建设获批，总投资3198亿元共26站_财经上下游_澎湃新闻-The Paper |url=https://www.thepaper.cn/newsDetail_forward_9417519 |access-date=2023-11-17 |website=thepaper.cn |archive-date=20 February 2021 |archive-url=https://web.archive.org/web/20210220014619/https://www.thepaper.cn/newsDetail_forward_9417519 |url-status=live }}

| 2030

| Part of the Sichuan–Tibet railway. Construction started in November 2020.{{Cite web|last=孙汝|title=Sichuan-Tibet Railway 'extremely challenging' project, expert says|url=https://www.chinadaily.com.cn/a/202103/10/WS604806fea31024ad0baae0eb.html|access-date=2021-10-16|website=China Daily|archive-date=16 October 2021|archive-url=https://web.archive.org/web/20211016225236/https://www.chinadaily.com.cn/a/202103/10/WS604806fea31024ad0baae0eb.html|url-status=live}}

| Athens Metro Line 4

| {{flagicon|Greece}} Athens, Greece

| {{convert|38200|m|mi|3|abbr=on}}{{Cite web|url=https://www.ametro.gr/wp-content/uploads/2022/05/%CE%91%CE%A5%CE%A4%CE%9F%CE%A8%CE%99%CE%91.pdf|date=May 5, 2023|title=ΚΑΤΑΣΚΕΥΗ ΤΗΣ ΝΕΑΣ ΓΡΑΜΜΗΣ 4 ΤΟΥ ΜΕΤΡΟ ΤΗΣ ΑΘΗΝΑΣ ΤΜΗΜΑ Α' «ΑΛΣΟΣ ΒΕΪΚΟΥ – ΓΟΥΔΗ» ΔΙΑΔΙΚΑΣΙΑ ΔΟΜΟΣΤΑΤΙΚΗΣ ΚΑΤΑΓΡΑΦΗΣ ΤΩΝ ΚΤΗΡΙΩΝ - ΚΑΤΑΣΚΕΥΩΝ ΣΤΗ ΖΩΝΗ ΕΠΙΡΡΟΗΣ ΤΟΥ ΕΡΓΟY|archive-url=https://web.archive.org/web/20220921225632/https://www.ametro.gr/wp-content/uploads/2022/05/%CE%91%CE%A5%CE%A4%CE%9F%CE%A8%CE%99%CE%91.pdf |archive-date=21 September 2022 }}

| 2029

| Construction of 1st phase started in June 2021,{{Cite web |date=2021-06-22 |title=Μετρό-Γραμμή 4: Ξεκινούν τα έργα - Οι 15 σταθμοί από Γαλάτσι έως Γουδί - Έτοιμο σε 8 χρόνια |url=https://www.naftemporiki.gr/finance/story/1740845/metro-grammi-4-ksekinoun-ta-erga-oi-15-neoi-stathmoi-apo-galatsi-eos-goudi-etoimo-se-8-xronia |access-date=2022-05-20 |website=naftemporiki.gr |language=el |archive-date=20 May 2022 |archive-url=https://web.archive.org/web/20220520184944/https://www.naftemporiki.gr/finance/story/1740845/metro-grammi-4-ksekinoun-ta-erga-oi-15-neoi-stathmoi-apo-galatsi-eos-goudi-etoimo-se-8-xronia |url-status=live }} total length may be changed.

| Sejila tunnel

| {{flagicon|China}} Tibet, China

| {{convert|37900|m|mi|3|abbr=on}}{{Cite journal |last1=Fu |first1=Helin |last2=Li |first2=Jie |last3=Li |first3=Guoliang |last4=Chen |first4=Jingjun |last5=An |first5=Pengtao |date=2023-06-01 |title=Determination of In Situ Stress by Inversion in a Superlong Tunnel Site Based on the Variation Law of Stress — A Case Study |journal=KSCE Journal of Civil Engineering |language=en |volume=27 |issue=6 |pages=2637–2653 |doi=10.1007/s12205-023-0415-3 |bibcode=2023KSJCE..27.2637F |s2cid=258273345 |issn=1976-3808 |doi-access=free }}

| 2030

| Part of the Sichuan–Tibet railway. Construction started in November 2020.{{Cite web|url=https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.seetao.com%2Fdetails%2F46798.html|title=Construction of the Ya'an-Nyingchi section of the Sichuan-Tibet Railway started--Seetao|via=Facebook|access-date=27 August 2023|archive-date=22 February 2024|archive-url=https://web.archive.org/web/20240222151118/https://www.seetao.com/details/46798.html|url-status=live}}{{Primary source inline|date=February 2024}}

| Daiichi Shutoken Tunnel{{cn|date=January 2023}}

| {{flagicon|Japan}} Tokyo, Japan

| {{convert|36924|m|mi|3|abbr=on}}{{cn|date=January 2023}}

| After 2027

| Part of the Chuo Shinkansen (Maglev)

| Woodsmith Mine Tunnel Potash Project Mineral Transport System (MTS)

| {{flagicon|United Kingdom}} North York Moors, United Kingdom

| {{convert|36700|m|mi|3|abbr=on}}{{cite web|url=https://www.theguardian.com/environment/2015/jun/30/north-york-moors-potash-mine-gets-17bn-go-ahead|title=North York Moors potash mine gets £1.7bn go-ahead|website=The Guardian|date=30 June 2015|access-date=2016-02-01|archive-date=15 March 2017|archive-url=https://web.archive.org/web/20170315001843/https://www.theguardian.com/environment/2015/jun/30/north-york-moors-potash-mine-gets-17bn-go-ahead|url-status=live}}

| (??){{Cite web |last=Kajastie |first=Nia |date=2022-12-13 |title=Woodsmith tunnel and shafts making 'great progress' following reconfiguration |url=https://www.geplus.co.uk/news/woodsmith-tunnel-and-shafts-making-great-progress-following-reconfiguration-13-12-2022/ |access-date=2023-10-24 |website=Ground Engineering (GE) |language=en |archive-date=30 October 2023 |archive-url=https://web.archive.org/web/20231030160348/https://www.geplus.co.uk/news/woodsmith-tunnel-and-shafts-making-great-progress-following-reconfiguration-13-12-2022/ |url-status=live }}

| 6 m in diameter{{cite web|url=http://www.constructionenquirer.com/2015/07/07/balfour-and-mcalpine-chase-1-7bn-york-potash-job/|title=Balfour and McAlpine chase £1.7bn York Potash job|website=Constructionenquirer.com|access-date=2016-02-01|archive-date=23 September 2015|archive-url=https://web.archive.org/web/20150923210508/http://www.constructionenquirer.com/2015/07/07/balfour-and-mcalpine-chase-1-7bn-york-potash-job/|url-status=live}} incorporating conveyor and maintenance access. Start of construction was planned for 2016, but actually started in April 2019.{{cite web|url=http://www.gazettelive.co.uk/business/york-potash-construction-could-start-9564014|title=York Potash: Construction 'could start this year' and what else you need to know|website=Gazettelive.co.uk|date=July 2015|access-date=2016-02-01|archive-date=24 September 2015|archive-url=https://web.archive.org/web/20150924021846/http://www.gazettelive.co.uk/business/york-potash-construction-could-start-9564014|url-status=live}}{{cite news |last1=Whipple |first1=Tom |title=Colossal bore gets priest's blessing to dig a giant tunnel at Yorkshire Mine |work=The Times |issue=72820 |date=13 April 2019 |page=22|issn=0140-0460}}

| Gaoligongshan Tunnel

| {{flagicon|China}} Yunnan, China

| {{convert|34538|m|mi|3|abbr=on}}

| 2025{{Cite web |title=Gaoligongshan Tunnel on Dali-Ruili Railway, The Longest Mountain Railway Tunnel in Asia |url=https://awards.ita-aites.org/images/CTUC_conference/Gaoligongshan.pdf |url-status=live |archive-url=https://web.archive.org/web/20230725013759/https://awards.ita-aites.org/images/CTUC_conference/Gaoligongshan.pdf |archive-date=25 July 2023}}

| Railway between Dali and Ruili. Construction started in August 2017.{{cite web |url=http://www.gov.cn/xinwen/2017-08/28/content_5221068.htm#1 |title=我国铁路第一长隧高黎贡山隧道进入全面施工阶段 |trans-title=Gaoligongshan, the longest Tunnel of China, entering the comprehensive construction phase |date=2017-08-28 |website=Gov.cn |agency=Xinhua News Agency |access-date=2017-09-03 |archive-date=3 September 2017 |archive-url=https://web.archive.org/web/20170903213057/http://www.gov.cn/xinwen/2017-08/28/content_5221068.htm#1 |url-status=live }}

| Daiichi Chukyoken Tunnel{{cn|date=January 2023}}

| {{flagicon|Japan}} Nagoya, Japan

| {{convert|34210|m|mi|3|abbr=on}}{{cn|date=January 2023}}

| After 2027

| Part of the Chuo Shinkansen (Maglev)

| L9

|{{flagicon|Spain}} Barcelona, Spain

| {{convert|33000|m|mi|3|abbr=on}}

| (??)
(2009–2016 partial completion)

| Excluding branches. Northern section of the line is in operation since 2009-12-13. Southern section of the line is in operation since 2016-02-12. Future of central section is unclear.

| Koralm Tunnel

| {{flagicon|Austria}} Koralpe, Austria

| {{convert|32900|m|mi|3|abbr=on}}

| 2025{{Cite web|url = https://presse-oebb.at/news-koralmbahn-noch-200-tage-bis-zur-inbetriebnahme?id=218062&menueid=27021&l=deutsch|title = Koralmbahn: Noch 200 Tage bis zur Inbetriebnahme|date = 2025-05-27|access-date = 31 May 2025}}

| Part of the Koralm Railway; boring of main tunnel started at the west portal in May 2010.{{cite web |url=http://www.oebb.at/infrastruktur/de/5_0_fuer_Generationen/5_4_Wir_bauen_fuer_Generationen/5_4_1_Schieneninfrastruktur/Pontebbanaachse_Suedbahn/Koralmbahn/Wettmannstaetten__St._Andrae/index.jsp |title= ÖBB-Infrastruktur AG|website=oebb.at |archive-url=https://web.archive.org/web/20121130092401/http://www.oebb.at/infrastruktur/de/5_0_fuer_Generationen/5_4_Wir_bauen_fuer_Generationen/5_4_1_Schieneninfrastruktur/Pontebbanaachse_Suedbahn/Koralmbahn/Wettmannstaetten__St._Andrae/index.jsp |archive-date=30 November 2012}}

| Oshima Tunnel

| {{flagicon|Japan}} Hokkaido, Japan

| {{convert|32675|m|mi|3|abbr=on}}

| 2031

| Part of the Hokkaido Shinkansen.

| Cross Island Line

| {{Flagicon|Singapore}} MRT, Singapore

| {{Convert|29000|m|mi|abbr=on}}{{Cite web|url=https://www.straitstimes.com/singapore/transport/first-phase-of-cross-island-mrt-line-finalised-will-have-12-stations|title=First phase of Cross Island MRT line finalised; will have 12 stations|date=2019-01-25|website=The Straits Times|language=en|access-date=2019-06-12|archive-date=25 January 2019|archive-url=https://web.archive.org/web/20190125130935/https://www.straitstimes.com/singapore/transport/first-phase-of-cross-island-mrt-line-finalised-will-have-12-stations|url-status=live}} (Phase 1 only)

| 2030 (Phase 1)
2032 (Phase 2)

| Construction of Phase 1 started in January 2023{{cite web | url=https://www.lta.gov.sg/content/ltagov/en/newsroom/2023/1/news-releases/construction_commences_on_CRL.html | title=LTA | Construction Commences on the Cross Island Line | access-date=25 July 2023 | archive-date=19 January 2023 | archive-url=https://web.archive.org/web/20230119015146/https://www.lta.gov.sg/content/ltagov/en/newsroom/2023/1/news-releases/construction_commences_on_CRL.html | url-status=live }}

| NCP Canal Main Tunnel

| {{flagicon|Sri Lanka}} Anuradhapura East, Sri Lanka

| {{convert|27800|m|mi|3|abbr=on}}

| 2025

| Part of North Central Province Canal under Mahaweli Development programme. Low slope tunnel with gravity flow, 8m in diameter. Supplies water from Moragahakanda Reservoir to North Central and Northern Provinces.{{cite web |title=About NCPCP |date=1 November 2021 |url=http://www.mwsip.lk/index.php?option=com_content&view=article&id=5&Itemid=127&lang=en |website=Mahaweli Water Security Investment Program |access-date=11 November 2021|url-status=live |archive-url=https://web.archive.org/web/20211119052913/http://www.mwsip.lk/index.php?option=com_content&view=article&id=5&Itemid=127&lang=en |archive-date=19 November 2021 }}

| Valico Tunnel

| {{flagicon|Italy}} Ligurian Apennines, Italy

| {{convert|27342|m|mi|3|abbr=on}}{{cite web | url=https://structurae.net/en/structures/valico-tunnel-2021 | title=Valico Tunnel (Alessandria/Genova, 2021) | access-date=25 July 2023 | archive-date=25 July 2023 | archive-url=https://web.archive.org/web/20230725013030/https://structurae.net/en/structures/valico-tunnel-2021 | url-status=live }}

| 2026

| Breakthrough in September 2020.{{cite web | url=https://www.geplus.co.uk/news/genoa-milan-high-speed-railway-reaches-double-tunnel-breakthrough-28-09-2020/ | title=Genoa-Milan high-speed railway marks double tunnel breakthrough | date=28 September 2020 | access-date=25 July 2023 | archive-date=25 July 2023 | archive-url=https://web.archive.org/web/20230725013023/https://www.geplus.co.uk/news/genoa-milan-high-speed-railway-reaches-double-tunnel-breakthrough-28-09-2020/ | url-status=live }} Part of the Tortona–Genoa high-speed railway.

| Semmering Base Tunnel

| {{flagicon|Austria}} Lower Austria/Styria, Austria

| {{convert|27300|m|mi|3|abbr=on}}

| 2030{{cite web | url=https://presse-oebb.at/News_Detail.aspx?id=155207 | title=Geologische Störzone führt zu späterer Fertigstellung des Semmering-Basistunnels | access-date=25 July 2023 | archive-date=28 January 2023 | archive-url=https://web.archive.org/web/20230128214455/https://presse-oebb.at/News_Detail.aspx?id=155207 | url-status=live }}

| Construction of the first contract section started in January 2014.{{cite web |url=http://www.oebb.at/infrastruktur/de/Presse/Presseinformationen/2014_01_10_Semmering-Basistunnel_neu_-_Baustart_des_ersten_Tunnelbauloses/index.jsp |title=ÖBB Infrastruktur AG: 2014_01_10_Semmering-Basistunnel neu – Baustart des ersten Tunnelbauloses |website=oebb.at |access-date=2 February 2022 |archive-url=https://web.archive.org/web/20140223015317/http://www.oebb.at/infrastruktur/de/Presse/Presseinformationen/2014_01_10_Semmering-Basistunnel_neu_-_Baustart_des_ersten_Tunnelbauloses/index.jsp |archive-date=23 February 2014 |url-status=dead}} Will cut travel time between Vienna and Graz by 30 minutes and is part of the Baltic–Adriatic Corridor

| Rogfast tunnel

| {{flagicon|Norway}} Randaberg–Bokn, Norway

| {{convert|26700|m|mi|3|abbr=on}}

| 2033{{cite web | url=https://www.bygg.no/slik-skal-rogfast-ferdigstilles-til-planlagt-tid/1493596!/ | title=(+) Slik skal Rogfast ferdigstilles til planlagt tid | date=18 March 2022 | access-date=19 February 2024 | archive-date=23 September 2023 | archive-url=https://web.archive.org/web/20230923231513/https://www.bygg.no/slik-skal-rogfast-ferdigstilles-til-planlagt-tid/1493596!/ | url-status=live }}

| Construction started in January 2018, halted October 2019 due to expected cost overruns, revised plan and 48% cost increase approved November 2020; construction restarted late 2021.{{cite news |title=Regjeringen klar for å gå videre med Rogfast |language=no |trans-title=The Government is Ready to Move Forward with Rogfast |first1=Syed Ali Shahbaz |last1=Akhtar |first2=Cathrine |last2=Oftedahl |first3=Gunnar |last3=Morsund |publisher=NRK |date=2020-11-20 |url=https://www.nrk.no/rogaland/regjeringen-klar-for-a-ga-videre-med-rogfast-1.15253186 |access-date=2020-12-27 |archive-date=24 August 2021 |archive-url=https://web.archive.org/web/20210824065731/https://www.nrk.no/rogaland/regjeringen-klar-for-a-ga-videre-med-rogfast-1.15253186 |url-status=live }} Will be the longest road tunnel in the world, and also the deepest undersea tunnel, {{convert|392|m|ft}} below sea level. It will also have a {{convert|4100|m|mi|3|abbr=on}} connection tunnel from Kvitsøy to the main tunnel.

| Sasson Tunnel{{cn|date=January 2023}}

| {{flagicon|Japan}} Hokkaido, Japan

| {{convert|26230|m|mi|3|abbr=on}}{{cn|date=January 2023}}

| 2031

| Part of the Hokkaido Shinkansen.

| Suburban Rail Loop East

| {{Flagicon|Australia}} Melbourne, Victoria, Australia

| {{Convert|26000|m|mi|abbr=on}}{{efn|Length does not include SRL North or West.}}

| 2035{{Cite web|url=https://bigbuild.vic.gov.au/projects/suburban-rail-loop/srl-east|title=SRL East|website=Victoria's Big Build|date=11 May 2022|access-date=15 May 2022|archive-date=27 February 2023|archive-url=https://web.archive.org/web/20230227045421/https://bigbuild.vic.gov.au/projects/suburban-rail-loop/srl-east|url-status=live}}

| Construction started in June 2022.{{Cite web |title=Works Start Today on Victoria's Suburban Rail Loop {{!}} Premier of Victoria |url=http://www.premier.vic.gov.au/works-start-today-victorias-suburban-rail-loop |access-date=2022-06-02 |website=premier.vic.gov.au |language=en |archive-date=1 June 2022 |archive-url=https://web.archive.org/web/20220601230218/https://www.premier.vic.gov.au/works-start-today-victorias-suburban-rail-loop |url-status=live }} SRL North is still under early planning, projected to be completed by 2053.

| Mae Taeng–Mae Ngat Tunnel{{cite web |url=http://www.chiangmaicitylife.com/news/5-year-project-to-bring-more-water-to-chiang-mai-through-new-water-tunnels/ |website=Chiangmaicitylife.com |title=5 Year Project to Bring More Water To Chiang Mai Through New Water Tunnels |author=CityNews |date=2016-06-30 |language=en |access-date=12 July 2012 |archive-date=3 October 2016 |archive-url=https://web.archive.org/web/20161003220656/http://www.chiangmaicitylife.com/news/5-year-project-to-bring-more-water-to-chiang-mai-through-new-water-tunnels/ |url-status=live }}

| {{flagicon|Thailand}} Chiang Mai, Thailand

| {{convert|25624|m|mi|3|abbr=on}}

| (??){{Cite web |title=Protests greet PM in Chiang Mai, over 2,000 police provide protection |url=https://www.thaipbsworld.com/protests-greet-pm-in-chiang-mai-over-2000-police-provide-protection/ |access-date=2023-10-24 |website=thaipbsworld.com |language=en-US |archive-date=30 October 2023 |archive-url=https://web.archive.org/web/20231030155526/https://www.thaipbsworld.com/protests-greet-pm-in-chiang-mai-over-2000-police-provide-protection/ |url-status=live }}

| 4 m in diameter. This tunnel is a part of "Mae Taeng–Mae Ngat–Mae Kuang Diversion Tunnel Project"

| Minami Alps Tunnel{{cn|date=January 2023}}

| {{flagicon|Japan}} Akaishi Mountains, Japan

| {{convert|25019|m|mi|3|abbr=on}}{{cn|date=January 2023}}

| After 2027

| Part of the Chuo Shinkansen (Maglev)

| Chuo Alps Tunnel{{cn|date=January 2023}}

| {{flagicon|Japan}} Kiso Mountains, Japan

| {{convert|23288|m|mi|3|abbr=on}}{{cn|date=January 2023}}

| After 2027

| Part of the Chuo Shinkansen (Maglev)

| Metro Manila Subway

| {{flagicon|Philippines}} Metro Manila, Philippines

| {{convert|23160|m|mi|3|abbr=on}}

| 2028

| Only for the dedicated mainline between {{stn|East Valenzuela}} and {{stn|FTI}}.{{cite news |url=https://www.rappler.com/nation/167250-duterte-abe-mega-manila-subway-deal |title=Duterte, Abe may sign Mega Manila subway deal in November |work=Rappler |access-date=19 April 2017 |date=18 April 2017 |author=Ranada, Pia |archive-date=19 April 2017 |archive-url=https://web.archive.org/web/20170419082004/http://www.rappler.com/nation/167250-duterte-abe-mega-manila-subway-deal |url-status=live }} To be partially opened in 2025.{{Cite news|last=Mercurio|first=Richmond|date=19 April 2022|title=Metro Manila subway partial opening moved to 2025 – DOTr|url=https://www.philstar.com/nation/2022/04/19/2175154/metro-manila-subway-partial-opening-moved-2025-dotr|work=The Philippine Star|location=Manila|access-date=19 April 2022|archive-date=19 April 2022|archive-url=https://web.archive.org/web/20220419072030/https://www.philstar.com/nation/2022/04/19/2175154/metro-manila-subway-partial-opening-moved-2025-dotr|url-status=live}}

| Sengli Daban Tunnel

| {{flagicon|China}} Xinjiang, China

| {{convert|22035|m|mi|3|abbr=on}}

| 2026{{cite web | url=http://english.sina.com/china/s/2021-02-08/detail-ikftssap4713769.shtml | title=Tianshan Shengli tunnel under construction in Xinjiang – China News – SINA English | access-date=22 January 2022 | archive-date=22 January 2022 | archive-url=https://web.archive.org/web/20220122004945/http://english.sina.com/china/s/2021-02-08/detail-ikftssap4713769.shtml | url-status=live }}

| Construction started in 2020. It bypasses Sengli Daban mountain pass which sits up at 4091 meters above the sea level. Once completed, it will become the longest road tunnel in the world at an altitude of over 4000m.

| Thane Creek Tunnel{{cite web | url=https://www.hindustantimes.com/cities/mumbai-news/nhsrcl-opens-tender-for-21-km-tunnel-between-bkc-and-thane-101675970767650.html | title=NHSRCL opens tender for 21-km tunnel between BKC and Thane | date=10 February 2023 | access-date=19 February 2024 | archive-date=19 February 2024 | archive-url=https://web.archive.org/web/20240219002137/https://www.hindustantimes.com/cities/mumbai-news/nhsrcl-opens-tender-for-21-km-tunnel-between-bkc-and-thane-101675970767650.html | url-status=live }}

| {{flagicon|India}} Mumbai, India

| {{convert|21150|m|mi|3|abbr=on}}{{cite web | url=https://themetrorailguy.com/2023/11/12/mumbai-ahmedabad-bullet-train-afcons-begins-piling-work-for-shaft-2/ | title=Mumbai-Ahmedabad Bullet Train: Afcons Begins Piling Work for Shaft-2 | date=12 November 2023 | access-date=19 February 2024 | archive-date=19 February 2024 | archive-url=https://web.archive.org/web/20240219002142/https://themetrorailguy.com/2023/11/12/mumbai-ahmedabad-bullet-train-afcons-begins-piling-work-for-shaft-2/ | url-status=live }}

| 2028{{cite web | url=https://themetrorailguy.com/2023/07/18/herrenknecht-to-supply-mumbai-ahmedabad-bullet-trains-tunnel-boring-machines/ | title=Herrenknecht to Supply Mumbai-Ahmedabad Bullet Train's Tunnel Boring Machines | date=18 July 2023 | access-date=19 February 2024 | archive-date=19 February 2024 | archive-url=https://web.archive.org/web/20240219002136/https://themetrorailguy.com/2023/07/18/herrenknecht-to-supply-mumbai-ahmedabad-bullet-trains-tunnel-boring-machines/ | url-status=live }}

| Part of the Mumbai–Ahmedabad high speed railway, construction started in November 2023,{{cite web | url=https://themetrorailguy.com/2023/07/18/herrenknecht-to-supply-mumbai-ahmedabad-bullet-trains-tunnel-boring-machines/ | title=Herrenknecht to Supply Mumbai-Ahmedabad Bullet Train's Tunnel Boring Machines | date=18 July 2023 | access-date=19 February 2024 | archive-date=19 February 2024 | archive-url=https://web.archive.org/web/20240219002136/https://themetrorailguy.com/2023/07/18/herrenknecht-to-supply-mumbai-ahmedabad-bullet-trains-tunnel-boring-machines/ | url-status=live }} 13 m diameter.{{cite web | url=https://www.nhsrcl.in/en/media/press-release/nhsrcl-signs-contract-construction-21-km-long-tunnel-including-indias-first-7 | title=NHSRCL Signs Contract for the Construction of 21 km Long Tunnel including India's First 7 Km long Undersea Rail Tunnel | NHSRCL | access-date=19 February 2024 | archive-date=19 February 2024 | archive-url=https://web.archive.org/web/20240219005654/https://www.nhsrcl.in/en/media/press-release/nhsrcl-signs-contract-construction-21-km-long-tunnel-including-indias-first-7 | url-status=live }}

| Keylong Rail & Road Tunnel

| {{flagicon|India}} Kyelang, India

| {{convert|21150|m|mi|3|abbr=on}}

|

| Part of the Bhanupali-Leh Railway & Roadway Corridor, construction started in February 2024.

| Alia Tunnel{{Cite web |last=Maria |first=Roberto Di |date=2022-02-07 |title=RADDOPPIO PALERMO-CATANIA, PRONTO IL PROGETTO FIUMETORTO-LERCARA - Siciliainprogress |url=https://www.siciliainprogress.com/2022/02/07/fiumetorto-lercara/ |access-date=2022-04-11 |language=it-IT}}

| {{flagicon|Italy}} Sicily, Italy

| {{convert|19900|m|mi|3|abbr=on}}{{cite web | url=https://tunnelpro.it/en/projects/pa-ct-l12 | title=PA-CT L1+2 | TunnelPro }}

| 2030{{cite web | url=https://www.newcivilengineer.com/latest/webuild-jv-snags-second-1bn-sicily-high-speed-rail-construction-deal-08-06-2023/ | title=Webuild JV snags another £1bn Sicily high speed rail construction deal | date=8 June 2023 }}

| Part of the Palermo–Catania high-speed railway

| Bentong Tunnel (Genting Tunnel)

| {{flagicon|Malaysia}} Bentong, Pahang, Malaysia

| {{convert|18000|m|mi|3|abbr=on}}

| 2027

| Part of MRL East Coast Rail Link project. Will became the longest tunnel in South East Asia{{cite web |url=https://www.utusan.com.my/berita/2022/01/terowong-genting-ecrl-terpanjang-di-asia-tenggara/ |title=Terowong Genting ECRL terpanjang di Asia Tenggara |date=13 January 2022 |access-date=9 April 2022 |archive-date=13 January 2022 |archive-url=https://web.archive.org/web/20220113225817/https://www.utusan.com.my/berita/2022/01/terowong-genting-ecrl-terpanjang-di-asia-tenggara/ |url-status=live }}

| Shiribeshi Tunnel{{cn|date=January 2023}}

| {{flagicon|Japan}} Hokkaido, Japan

| {{convert|17975|m|mi|3|abbr=on}}{{cn|date=January 2023}}

| 2031

| Part of the Hokkaido Shinkansen.

| Fehmarn Belt Fixed Link

| {{flagicon|Germany}} {{flagicon|Denmark}} Fehmarn Belt, Germany/Denmark

| {{convert|17600|m|mi|3|abbr=on}}

| 2029{{cite web|url=https://www.spiegel.de/wirtschaft/unternehmen/fehmarn-belt-tunnel-streit-ueber-ostsee-querung-nach-daenemark-kommt-vor-gericht-a-bda38feb-12bb-4cd5-a426-fa6c241bd350|title=Milliarden unters Meer|work=Der Spiegel|date=2020-05-26|access-date=21 January 2022|archive-date=22 September 2020|archive-url=https://web.archive.org/web/20200922170621/https://www.spiegel.de/wirtschaft/unternehmen/fehmarn-belt-tunnel-streit-ueber-ostsee-querung-nach-daenemark-kommt-vor-gericht-a-bda38feb-12bb-4cd5-a426-fa6c241bd350|url-status=live}}

| Construction started in January 2021{{cite web |url=https://trm.dk/nyheder/2021/nu-starter-anlaegsarbejdet-paa-femern-baelt-forbindelsen/ |title=Nu starter anlægsarbejdet på Femern Bælt-forbindelsen |date=1 January 2021 |access-date=26 June 2021 |archive-date=23 February 2022 |archive-url=https://web.archive.org/web/20220223010515/https://www.trm.dk/nyheder/2021/nu-starter-anlaegsarbejdet-paa-femern-baelt-forbindelsen |url-status=live }}

| Tateiwa Tunnel{{cn|date=January 2023}}

| {{flagicon|Japan}} Hokkaido, Japan

| {{convert|16980|m|mi|3|abbr=on}}{{cn|date=January 2023}}

| 2031

| Part of the Hokkaido Shinkansen.

| Förbifart Stockholm{{cite web |url=http://www.trafikverket.se/forbifartstockholm |title=E4 Förbifart Stockholm – Trafikverket |website=Trafikverket.se |date=2015-09-25 |access-date=2016-02-01 |archive-date=21 March 2015 |archive-url=https://web.archive.org/web/20150321024640/http://www.trafikverket.se/forbifartstockholm |url-status=live }}

| {{flagicon|Sweden}} Stockholm, Sweden

| {{convert|16500|m|mi|3|abbr=on}}

| 2030{{cite web | url=https://byggteknikforlaget.se/forlangd-byggtid-och-okad-kostnad-for-forbifart-stockholm/ | title=Förlängd byggtid och ökad kostnad för Förbifart Stockholm | date=28 November 2019 | access-date=1 February 2022 | archive-date=1 February 2022 | archive-url=https://web.archive.org/web/20220201234913/https://byggteknikforlaget.se/forlangd-byggtid-och-okad-kostnad-for-forbifart-stockholm/ | url-status=live }}

| Construction started in August 2014

| Tokyo Gaikan Tunnel{{cn|date=January 2023}}

| {{flagicon|Japan}} Tokyo, Japan

| {{convert|16200|m|mi|3|abbr=on}}{{cn|date=January 2023}}

| 2030{{cn|date=January 2023}}

| Part of the C3 Tokyo Gaikan Expressway.

| Zhoushan underwater tunnel

| {{flagicon|China}} Zhejiang, China

| {{convert|16200|m|mi|3|abbr=on}}{{cite web | url=http://en.people.cn/n3/2020/0803/c90000-9717580.html | title=Undersea rail tunnel plan complete – People's Daily Online | access-date=22 January 2022 | archive-date=22 January 2022 | archive-url=https://web.archive.org/web/20220122004954/http://en.people.cn/n3/2020/0803/c90000-9717580.html | url-status=live }}

| 2026

| Part of the Ningbo–Zhoushan railway. Construction started in December 2020.{{cite web | url=https://news.yantuchina.com/46752.html | title=世界级跨海工程甬舟铁路开工建设-岩土在线 | access-date=22 January 2022 | archive-date=22 January 2022 | archive-url=https://web.archive.org/web/20220122004956/https://news.yantuchina.com/46752.html | url-status=live }}

| Chiltern tunnel

| {{flagicon|United Kingdom}} Chiltern Hills, United Kingdom

| {{convert|16040|m|mi|3|abbr=on}}

| 2029–2033{{Cite web |title=HS2 Phase One full business case |url=https://www.gov.uk/government/publications/hs2-phase-one-full-business-case |access-date=2023-10-24 |website=GOV.UK |language=en |archive-date=19 April 2020 |archive-url=https://web.archive.org/web/20200419044453/https://www.gov.uk/government/publications/hs2-phase-one-full-business-case |url-status=live }}

| Part of High Speed 2,{{Cite web|title=Chiltern Tunnel|url=https://www.hs2.org.uk/building-hs2/tunnels/tunnel-drives/chiltern-tunnel/|access-date=2022-02-04|website=High Speed 2|language=en-GB|archive-date=4 February 2022|archive-url=https://web.archive.org/web/20220204093420/https://www.hs2.org.uk/building-hs2/tunnels/tunnel-drives/chiltern-tunnel/|url-status=live}} construction started in May 2021,{{Cite web|date=2021-05-13|title=Work begins boring first HS2 tunnel under Chiltern Hills|url=http://www.theguardian.com/uk-news/2021/may/13/work-begins-under-chiltern-hills-boring-first-hs2-tunnel|access-date=2021-05-21|website=The Guardian|language=en|archive-date=19 May 2021|archive-url=https://web.archive.org/web/20210519201600/https://www.theguardian.com/uk-news/2021/may/13/work-begins-under-chiltern-hills-boring-first-hs2-tunnel|url-status=live}} 9.1 m internal diameter{{Cite web|title=The HS2 Tunnel Boring Machines (TBMs)|url=https://www.hs2.org.uk/building-hs2/tunnels/the-hs2-tunnel-boring-machines/|access-date=2021-05-21|website=High Speed 2|language=en-GB|archive-date=21 May 2021|archive-url=https://web.archive.org/web/20210521124313/https://www.hs2.org.uk/building-hs2/tunnels/the-hs2-tunnel-boring-machines/|url-status=live}}

| Uchiura Tunnel{{cn|date=January 2023}}

| {{flagicon|Japan}} Hokkaido, Japan

| {{convert|15560|m|mi|3|abbr=on}}{{cn|date=January 2023}}

| 2031

| Part of the Hokkaido Shinkansen.

| Ina Sanchi Tunnel{{cn|date=January 2023}}

| {{flagicon|Japan}} Nagano, Japan

| {{convert|15300|m|mi|3|abbr=on}}{{cn|date=January 2023}}

| After 2027

| Part of the Chuo Shinkansen (Maglev)

| Devprayag Rail Tunnel{{cn|date=January 2023}}

| {{flagicon|India}} Uttarakhand, India

| {{convert|15270|m|mi|3|abbr=on}} {{cn|date=January 2023}}

| 2024–2025{{cn|date=January 2023}}

| Part of Rishikesh–Karnaprayag line{{Cite news |date=2022-08-30 |title=To be built at Rs 23,000 crore, Uttarakhand to get India's 'longest railway tunnel' |work=The Times of India |url=https://timesofindia.indiatimes.com/city/dehradun/to-be-built-at-rs-23000-crore-uttarakhand-to-get-indias-longest-railway-tunnel/articleshow/93866506.cms |access-date=2023-05-02 |issn=0971-8257 |archive-date=3 May 2023 |archive-url=https://web.archive.org/web/20230503000637/https://timesofindia.indiatimes.com/city/dehradun/to-be-built-at-rs-23000-crore-uttarakhand-to-get-indias-longest-railway-tunnel/articleshow/93866506.cms |url-status=live }}

| Hiyoshi Tunnel{{cn|date=January 2023}}

| {{flagicon|Japan}} Gifu, Japan

| {{convert|14532|m|mi|3|abbr=on}}{{cn|date=January 2023}}

| After 2027

| Part of the Chuo Shinkansen (Maglev)

| Zoji-la Tunnel

| {{flagicon|India}} Zoji La Pass, India

| {{convert|14200|m|mi|3|abbr=on}}{{cite web|url=https://indianexpress.com/article/india/j-k-pm-modi-inaugurates-zojila-tunnel-project-in-leh-all-you-need-to-know-about-indias-longest-tunnel-5182934/|title=PM Modi inaugurates Zojila project in Leh: All you need to know about India's longest tunnel|date=19 May 2018|website=The Indian Express|access-date=16 June 2019|archive-date=15 December 2019|archive-url=https://web.archive.org/web/20191215182759/https://indianexpress.com/article/india/j-k-pm-modi-inaugurates-zojila-tunnel-project-in-leh-all-you-need-to-know-about-indias-longest-tunnel-5182934/|url-status=live}}

| 2026

| Construction started in October 2020{{cite web | url=https://www.hindustantimes.com/india-news/gadkari-to-initiate-first-blasting-of-all-weather-zojila-tunnel-between-srinagar-and-leh/story-M1IzoZ93isMJjqgRP8C4YO.html | title=Gadkari to initiate first blasting of all-weather Zojila Tunnel between Srinagar and Leh | date=15 October 2020 | access-date=21 January 2022 | archive-date=21 January 2022 | archive-url=https://web.archive.org/web/20220121175906/https://www.hindustantimes.com/india-news/gadkari-to-initiate-first-blasting-of-all-weather-zojila-tunnel-between-srinagar-and-leh/story-M1IzoZ93isMJjqgRP8C4YO.html | url-status=live }}

| Patalpani Rail Tunnel{{cn|date=January 2023}}

| {{flagicon|India}} Madhya Pradesh, India

| {{convert|14000|m|mi|3|abbr=on}}{{cn|date=January 2023}}

| 2025{{cn|date=January 2023}}

|

| MRT Orange Line{{cite web |url=http://www.tunnel-online.info/en/artikel/tunnel_Start_for_new_Metro_Line_and_Extension_Projects_in_Bangkok_2798278.html |title=Start for new Metro Line and Extension Projects in Bangkok; The Robbins Company |website=Tunnel-online.info |date=20 February 2017 |access-date=12 July 2017 |archive-date=6 August 2017 |archive-url=https://web.archive.org/web/20170806085614/http://www.tunnel-online.info/en/artikel/tunnel_Start_for_new_Metro_Line_and_Extension_Projects_in_Bangkok_2798278.html |url-status=live }}

| {{flagicon|Thailand}} Bangkok, Thailand

| {{convert|13770|m|mi|3|abbr=on}}

| 2025

| Orange Line Phase 1

| Northolt tunnel

| {{flagicon|United Kingdom}} West London, United Kingdom

| {{convert|13500|m|mi|3|abbr=on}}

| 2029–2033

| Part of High Speed 2, construction started in October 2022.{{cite web | url=https://www.ianvisits.co.uk/articles/hs2-starts-digging-26-miles-of-tunnel-under-london-57926/ | title=HS2 starts digging 26 miles of tunnel under London | date=6 October 2022 | access-date=4 July 2023 | archive-date=9 October 2022 | archive-url=https://web.archive.org/web/20221009214521/https://www.ianvisits.co.uk/articles/hs2-starts-digging-26-miles-of-tunnel-under-london-57926/ | url-status=live }}

| İzmir Metro Line M2

| {{flagicon|Turkey}} İzmir, Turkey

| {{convert|13500|m|mi|3|abbr=on}}{{Cite web|url=https://www.izmir.bel.tr/tr/Haberler/buca-metrosu-nun-yapimi-suruyor/47126/156|title=Haberler | Buca Metrosu'nun yapımı sürüyor|first=ÜNİBEL|last=A.Ş|website=İzmir Büyükşehir Belediyesi|access-date=27 August 2023|archive-date=27 August 2023|archive-url=https://web.archive.org/web/20230827104632/https://www.izmir.bel.tr/tr/Haberler/buca-metrosu-nun-yapimi-suruyor/47126/156|url-status=live}}

| 2026

|

| Istanbul Metro (Line M12)

| {{flagicon|Turkey}} Istanbul, Turkey

| {{convert|13030|m|mi|3|abbr=on}}

| 2025

|

| Tibet Xinjiang Tunnel

| {{flagicon|China}} Tibet/Xinjiang, China

| {{convert|1000000|m|mi|1|abbr=on}}

| ???

| China preparing world's longest tunnel to divert Tibet river to desert{{Cite web|date=2017-10-31|title=China preparing world's longest tunnel to divert Tibet river to desert|url=https://www.globalconstructionreview.com/china-preparing-worlds-longest-tunnel-divert-tibet/|access-date=2021-11-18|website=Global Construction Review|language=en-GB|archive-date=18 November 2021|archive-url=https://web.archive.org/web/20211118105654/https://www.globalconstructionreview.com/china-preparing-worlds-longest-tunnel-divert-tibet/|url-status=live}}

| Bohai Strait tunnel

| {{flagicon|China}} Bohai Strait, China

| {{convert|123000|m|mi|1|abbr=on}}

| ???

| Tunnel between Dalian on the Liaodong Peninsula and Yantai on the Shandong Peninsula.

| Talsinki

| {{flagicon|Finland}} {{flagicon|Estonia}}

Helsinki/Tallinn, Finland/Estonia

| {{Convert|100000|m|mi|1|abbr=on}}

| After 2030

| Awaiting financing

| Qinling Tunnel, Han River Diversion to Wei River{{cn|date=January 2023}}

| {{flagicon|China}} Shaanxi, China

| {{convert|98300|m|mi|1|abbr=on}}{{cn|date=January 2023}}

| ???

|

| Serra do Mar Tunnel{{cite web | url=https://viatrolebus.com.br/2013/12/trem-que-vai-ligar-sao-paulo-a-santos-correra-por-nova-ferrovia/ | title=Túnel de 30 km deve abrigar trem que vai ligar São Paulo a Santos | date=9 December 2013 | access-date=25 July 2023 | archive-date=25 July 2023 | archive-url=https://web.archive.org/web/20230725022622/https://viatrolebus.com.br/2013/12/trem-que-vai-ligar-sao-paulo-a-santos-correra-por-nova-ferrovia/ | url-status=live }}

| {{flagicon|Brazil}} Brazil, between São Paulo and Santos

| {{convert|30000|m|mi|1|abbr=on}}

| ???

|

| Suðuroyartunnilin

| {{flagicon|Faroe Islands}} Faroe Islands, linking Suðuroy island to Sandoy island

| {{convert|26000|m|mi|1|abbr=on}}

| After 2030

| Feasibility study

| Tachlovice Tunnel

| {{flagicon|Czech Republic}} Prague/Beroun, Czech Republic

| {{convert|24700|m|mi|1|abbr=on}}{{cite web|url=http://en.infoglobe.cz/topics-of-interest/do-you-know-that-railway-tunnels/|title=Do You Know, That? – Railway Tunnels|website=En.infoglobe.cz|access-date=1 February 2016|archive-date=24 October 2021|archive-url=https://web.archive.org/web/20211024124634/https://en.infoglobe.cz/topics-of-interest/do-you-know-that-railway-tunnels/|url-status=live}}

| After 2035

| Project is on hold

| İzmir Metro Line M3

| {{flagicon|Turkey}} İzmir, Turkey

| {{convert|22300|m|mi|3|abbr=on}}

| 2020s

|

| Istanbul Metro (Line M13)

| {{flagicon|Turkey}} Istanbul, Turkey

| {{convert|21900|m|mi|1|abbr=on}}

| 2020s

|

| Grimsel Tunnel

| {{flagicon|Switzerland}} Grimsel Pass, Switzerland

| {{convert|21720|m|mi|1|abbr=on}}{{Cite web|url=https://www.grimseltunnel.ch/projekt/|title=Grimseltunnel - Projekt|website=grimseltunnel.ch|access-date=17 October 2020|archive-date=17 October 2020|archive-url=https://web.archive.org/web/20201017070043/https://www.grimseltunnel.ch/projekt/|url-status=live}}

| 2025/2026

| Feasibility study

| Pacheco Pass Tunnels

| {{flagicon|USA}} Pacheco Pass, California, United States

| {{convert|21000|m|mi|1|abbr=on}}

| 2031

| To be built as part of the California High-Speed Rail project

| Gohpur – Numaligarh Tunnel

| {{flagicon|India}} Assam, India

| {{convert|15600|m|mi|3|abbr=on}}{{cite web | url=https://themetrorailguy.com/2023/07/12/ict-bids-for-dpr-of-assams-tunnel-project-under-brahmaputra/ | title=ICT Bids for DPR of Assam's Tunnel Project Under Brahmaputra | date=12 July 2023 | access-date=19 February 2024 | archive-date=19 February 2024 | archive-url=https://web.archive.org/web/20240219013854/https://themetrorailguy.com/2023/07/12/ict-bids-for-dpr-of-assams-tunnel-project-under-brahmaputra/ | url-status=live }}

| ???

| Tunnel under the Brahmaputra River

| Kresna Gorge Tunnel{{cite news|title=The design of lot 3 of Struma motorway is completed|url=http://stroitelstvo.info/show.php?storyid=2184583|newspaper=stroitelstvo.info|date=2013-11-18|language=bg|url-status=dead|archive-url=https://web.archive.org/web/20131125203754/http://stroitelstvo.info/show.php?storyid=2184583|archive-date=25 November 2013}}

| {{flagicon|Bulgaria}} Kresna, Bulgaria

| {{convert|15400|m|mi|1|abbr=on}}

| Cancelled

| Part of Struma motorway, connecting Sofia and Athens.

| Agua Negra Tunnel

| {{flagicon|Argentina}} {{flagicon|Chile}} Agua Negra Pass, Argentina/Chile

| {{Convert|14000|m|mi|1|abbr=on}}

| ???

| Awaiting ratification by Chile{{Citation needed|date=July 2018}}

| Gadara Aqueduct

| Roman Empire

| {{convert|94000|m|mi|1|abbr=on}}

| 129–

| Water supply for the Decapolis in present-day Jordan