SM U-18

Beginning in October 1914, she was commanded by Kaptlt. von Hennig.Koerver, Hans Joachim (2008). Room 40: German Naval Warfare 1914-1918.

On her third mission, on 23 November U-18 penetrated the fleet anchorage of Scapa Flow via Hoxa Sound, following a steamer through the boom and entering the anchorage with little difficulty. However, the fleet was absent, being dispersed in anchorages on the west coast of Scotland and Ireland. As U-18 was making her way back out through Hoxa Sound to the open sea, her periscope was spotted by a guard boat. The trawler Dorothy Gray altered course and rammed the periscope, rendering it unserviceable. U-18 then suffered a failure of her diving plane motor and the boat became unable to maintain her depth, at one point even impacting the seabed. She was rammed a second time by destroyer {{HMS|Garry|1905|6}} and eventually, her captain was forced to surface and scuttle his command just outside the Hoxa Gate; all crew members, except one, were picked up by British boats.{{Cite book | last = Messimer | first = Dwight R. | title = Verschollen: World War I U-boat Losses | publisher = Naval Institute Press | year = 2002 | pages = 36–40 | isbn = 9781557504753}}Koerver. One crew member perished, while the remaining 22 were interned as prisoners of war.{{cite Uboat.net|id=18|name=U 18|type=1sub}}

The wreck lies {{convert|75|m|ft|abbr=on}} below the surface just outside the Hoxa Gate, at {{coord|58|41|N|02|55|W|display=title, inline}}.{{Cite book | last = Willmott | first = H.P. | title = The Last Century of Sea Power: From Port Arthur to Chanak, 1894-1922 | publisher = Indiana University Press | year = 2009 | page = 376 | isbn = 9780253352149}}

{{Reflist|group=Note}}

{{reflist}}

• {{cite book

|last1=Gröner

|first1=Erich

|last2=Jung

|first2=Dieter

|last3=Maass

|first3=Martin

|translator-last1=Thomas

|translator-first1=Keith

|translator-last2=Magowan

|translator-first2=Rachel

|year=1991

|title=U-boats and Mine Warfare Vessels

|volume=2

|series=German Warships 1815–1945

|location=London

|publisher=Conway Maritime Press

|isbn=0-85177-593-4

|ref=CITEREFGröner1991

}}

• {{cite book |title=Der Handelskrieg mit U-Booten. 5 Vols |last=Spindler |first=Arno |orig-year=1932|year=1966|publisher= Mittler & Sohn. Vols. 4+5, dealing with 1917+18, are very hard to find: Guildhall Library, London, has them all, also Vol. 1-3 in an English translation: The submarine war against commerce|location=Berlin }}
• {{cite book |title=Room 40: British Naval Intelligence 1914-1918|last=Beesly |first=Patrick |year=1982 |publisher= H Hamilton |location=London |isbn=978-0241108642 }}
• {{cite book |title=A Naval History of World War I|last=Halpern |first=Paul G. |year=1995 |publisher=Routledge |location=New York |isbn=978-1857284980 }}
• {{cite book |title=Die Unterseeboote der Kaiserlichen Marine |last=Roessler |first=Eberhard |year=1997 |publisher= Bernard & Graefe |location=Bonn |isbn=978-3763759637 }}
• {{cite book |title=Die U-Boote des Kaisers |last=Schroeder |first=Joachim |year=2002 |publisher= Bernard & Graefe |location=Bonn |isbn=978-3763762354 }}
• {{cite book |title=Room 40: German Naval Warfare 1914-1918. Vol I., The Fleet in Action|last=Koerver |first=Hans Joachim |year=2008 |publisher=LIS Reinisch |location=Steinbach |isbn=978-3-902433-76-3 }}
• {{cite book |title=Room 40: German Naval Warfare 1914-1918. Vol II., The Fleet in Being|last=Koerver |first=Hans Joachim |year=2009 |publisher=LIS Reinisch |location=Steinbach |isbn=978-3-902433-77-0 }}
• {{cite book

|last=Kemp

|first=Paul

|year=1997

|title=U-boats destroyed, German submarine losses in the World Wars

|location=London

|publisher=Arms & Armour Press

|isbn=1-85409-321-5

|page=9

}}

• {{cite Uboat.net

|id=18

|name=U 18

|type=1sub

}}

• [http://germannavalwarfare.info/indexbr.htm Room 40:] {{Webarchive|url=https://web.archive.org/web/20181015003000/http://germannavalwarfare.info/indexbr.htm |date=2018-10-15 }} original documents, photos and maps about World War I German submarine warfare and British Room 40 Intelligence from The National Archives, Kew, Richmond, UK.

{{U-17 class submarines}}

{{November 1914 shipwrecks}}

{{DEFAULTSORT:U0018}}

Category:U-boats commissioned in 1912

Category:1912 ships

Category:World War I submarines of Germany

Category:Maritime incidents in November 1914

Category:U-boats sunk in 1914

Category:U-boats sunk by British warships

Category:Type U 17 submarines

Category:Ships built in Danzig

Category:World War I shipwrecks in the North Sea

Category:U-boats sunk in collisions