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Operation Latchkey

{{Short description|Series of 1960s US nuclear tests}}

{{Use mdy dates|date=November 2018}}

{{Infobox nuclear weapons test

|name = Operation Latchkey

|picture =

|picture_description =

|country = United States

|test_site = {{plainlist|

  • NTS Area 12, Rainier Mesa
  • NTS Area 19, 20, Pahute Mesa
  • NTS Areas 5, 11, Frenchman Flat
  • NTS, Areas 1–4, 6–10, Yucca Flat
  • Salmon Site, near Lumberton, Mississippi}}

|period = 1966–1967

|number_of_tests = 38

|test_type = underground shaft, tunnel

|max_yield = {{convert|870|ktTNT|lk=in}}

|previous_series = Operation Flintlock (nuclear test)

|next_series = Operation Crosstie

}}

{{GeoGroup|article=Operation Latchkey}}

Operation Latchkey was a series of 38 nuclear tests conducted by the United States in 1966–1967 at the Nevada Test Site. These tests followed the Operation Flintlock series and preceded the Operation Crosstie series.

Nuclear tests

=Persimmon=

Persimmon included a vertical line-of-sight pipe fitted with a fast-acting closure. At the time of detonation, this vacuum pipe provided a pathway for neutrons from the nuclear device to travel to instruments in a tower located above the shot hole. A few seconds after detonation, these instruments and their samples were dragged out of the tower on a sled, before the subsidence crater formed and destroyed the tower.{{Cite AV media| publisher = Los Alamos Scientific Laboratory| title = Persimmon: A Nuclear Physics Experiment| accessdate = 2022-09-25| url = https://www.youtube.com/watch?v=wXmUVRD_OVk| archive-date = November 9, 2022| archive-url = https://web.archive.org/web/20221109053437/https://www.youtube.com/watch?v=wXmUVRD_OVk&gl=US&hl=en| url-status = live}}

List of the nuclear tests

{{see also|List of nuclear weapons tests of the United States}}

class="wikitable sortable"

|+ United States' Latchkey series tests and detonations

style="background:#ffdead;" | Name The US, France and Great Britain have code-named their test events, while the USSR and China did not, and therefore have only test numbers (with some exceptions – Soviet peaceful explosions were named). Word translations into English in parentheses unless the name is a proper noun. A dash followed by a number indicates a member of a salvo event. The US also sometimes named the individual explosions in such a salvo test, which results in "name1 – 1(with name2)". If test is canceled or aborted, then the row data like date and location discloses the intended plans, where known.

!style="background:#efefef;" | Date time (UT)

!style="background:#ffdead;" | Local time zoneTo convert the UT time into standard local, add the number of hours in parentheses to the UT time; for local daylight saving time, add one additional hour. If the result is earlier than 00:00, add 24 hours and subtract 1 from the day; if it is 24:00 or later, subtract 24 hours and add 1 to the day. All historical time zone data are derived from here:{{cite web| title=Time Zone Historical Database| publisher=iana.com| url=http://www.ietf.org/timezones/| access-date=March 8, 2014| archive-date=March 11, 2014| archive-url=https://web.archive.org/web/20140311224729/http://www.ietf.org/timezones/| url-status=live}}

!style="background:#efefef;" | LocationRough place name and a latitude/longitude reference; for rocket-carried tests, the launch location is specified before the detonation location, if known. Some locations are extremely accurate; others (like airdrops and space blasts) may be quite inaccurate. "~" indicates a likely pro-forma rough location, shared with other tests in that same area.

!style="background:#ffdead;" | Elevation + height Elevation is the ground level at the point directly below the explosion relative to sea level; height is the additional distance added or subtracted by tower, balloon, shaft, tunnel, air drop or other contrivance. For rocket bursts the ground level is "N/A". In some cases it is not clear if the height is absolute or relative to ground, for example, Plumbbob/John. No number or units indicates the value is unknown, while "0" means zero. Sorting on this column is by elevation and height added together.

!style="background:#efefef;" | Delivery Atmospheric, airdrop, balloon, gun, cruise missile, rocket, surface, tower, and barge are all disallowed by the Partial Nuclear Test Ban Treaty. Sealed shaft and tunnel are underground, and remained useful under the PTBT. Intentional cratering tests are borderline; they occurred under the treaty, were sometimes protested, and generally overlooked if the test was declared to be a peaceful use.
Purpose Include weapons development, weapon effects, safety test, transport safety test, war, science, joint verification and industrial/peaceful, which may be further broken down.

!style="background:#efefef;" | DeviceDesignations for test items where known, "?" indicates some uncertainty about the preceding value, nicknames for particular devices in quotes. This category of information is often not officially disclosed.

!style="background:#ffdead;" | YieldEstimated energy yield in tons, kilotons, and megatons. A ton of TNT equivalent is defined as 4.184 gigajoules (1 gigacalorie).

!style="background:#efefef;" class="unsortable" | FalloutRadioactive emission to the atmosphere aside from prompt neutrons, where known. The measured species is only iodine-131 if mentioned, otherwise it is all species. No entry means unknown, probably none if underground and "all" if not; otherwise notation for whether measured on the site only or off the site, where known, and the measured amount of radioactivity released.

!style="background:#ffdead;" class="unsortable" | References

!style="background:#efefef;" class="unsortable" | Notes

Saxon{{anchor|Saxon}}

| {{dts|1966|7|28}} 15:33:30.13

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U2cc {{coord|37.14044

116.13404|name=Saxon|display=inline}}

| {{sort|001257

}{{convert|1411|m|abbr=on}} – {{convert|153.04|m|abbr=on}}

| underground shaft,
peaceful research

|

| style="text-align:center;" | {{sort|000012000|1.2 kt}}

| Venting detected, {{convert|0.5|Ci|GBq|abbr=on}}

|

| Project Plowshare - excavation device development.

|-

! Rovena{{anchor|Rovena}}

| {{dts|1966|8|10}} 13:16:00.07

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U10s {{coord|37.16864|-116.04862|name=Rovena|display=inline}}

| {{sort|001082|}}{{convert|1278|m|abbr=on}} – {{convert|195.25|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000010000|1 kt}}

| Venting detected, {{convert|2|Ci|GBq|abbr=on}}

|

|

|-

! Tangerine{{anchor|Tangerine}}

| {{dts|1966|8|12}} 15:36:00.05

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U3eb {{coord|37.04629|-116.03007|name=Tangerine|display=inline}}

| {{sort|001111|}}{{convert|1199|m|abbr=on}} – {{convert|87.88|m|abbr=on}}

| underground shaft,
safety experiment

|

| style="text-align:center;" | {{sort|000000000|less than 20 kt}}

|

|

|

|-

! Derringer{{anchor|Derringer}}

| {{dts|1966|9|12}} 15:30:00.54

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U5i {{coord|36.87595|-115.95136|name=Derringer|display=inline}}

| {{sort|000757|}}{{convert|1013|m|abbr=on}} – {{convert|255.12|m|abbr=on}}

| underground shaft,
weapon effect

|

| style="text-align:center;" | {{sort|000078000|7.8 kt}}

| Venting detected off site, {{convert|12|kCi|TBq|abbr=on}}

|

|

|-

! Daiquiri{{anchor|Daiquiri}}

| {{dts|1966|9|23}} 18:00:00.04

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U7o {{coord|37.1033|-116.03657|name=Daiquiri|display=inline}}

| {{sort|000698|}}{{convert|1260|m|abbr=on}} – {{convert|561.15|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000000000|less than 20 kt}}

|

|

|

|-

! Newark{{anchor|Newark}}

| {{dts|1966|9|29}} 14:45:30.09

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U10u {{coord|37.16862|-116.04693|name=Newark|display=inline}}

| {{sort|001050|}}{{convert|1279|m|abbr=on}} – {{convert|228.63|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000040000|4 kt}}

| Venting detected, {{convert|290|Ci|GBq|abbr=on}}

|

|

|-

! Khaki{{anchor|Khaki}}

| {{dts|1966|10|15}} 19:00:00.05

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U3et {{coord|37.04704|-116.01772|name=Khaki|display=inline}}

| {{sort|000969|}}{{convert|1202|m|abbr=on}} – {{convert|232.55|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000000000|less than 20 kt}}

|

|

|

|-

! Simms{{anchor|Simms}}

| {{dts|1966|11|5}} 14:45:00.0

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U10w {{coord|37.1699|-116.04809|name=Simms|display=inline}}

| {{sort|001080|}}{{convert|1279|m|abbr=on}} – {{convert|198.15|m|abbr=on}}

| underground shaft,
peaceful research

|

| style="text-align:center;" | {{sort|000023000|2.3 kt}}

| Venting detected, {{convert|11|Ci|GBq|abbr=on}}

|

| Plowshare - evaluate clean nuclear explosives for excavation.

|-

! Ajax{{anchor|Ajax}}

| {{dts|1966|11|11}} 12:00:00.14

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U9al {{coord|37.13449|-116.05095|name=Ajax|display=inline}}

| {{sort|001015|}}{{convert|1254|m|abbr=on}} – {{convert|238.45|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000050000|5 kt}}

| Venting detected on site, {{convert|1|Ci|GBq|abbr=on}}

|

|

|-

! Cerise{{anchor|Cerise}}

| {{dts|1966|11|18}} 15:02:00.04

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U3eu {{coord|37.04273|-116.0113|name=Cerise|display=inline}}

| {{sort|000990|}}{{convert|1202|m|abbr=on}} – {{convert|211.09|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000070000|7 kt}}

| I-131 venting detected, 0

|

|

|-

! Vigil{{anchor|Vigil}}

| {{dts|1966|11|22}} 15:00:00.13

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U10ad {{coord|37.16934|-116.04918|name=Vigil|display=inline}}

| {{sort|001184|}}{{convert|1278|m|abbr=on}} – {{convert|93.68|m|abbr=on}}

| underground shaft,
safety experiment

|

| style="text-align:center;" | {{sort|000000000|less than 20 kt}}

| Venting detected on site, {{convert|0.0014|Ci|GBq|abbr=on}}

|

|

|-

! Sterling{{anchor|Sterling}}

| {{dts|1966|12|3}} 12:15:00.05

| style="text-align:center;" | CST (–6 hrs)
|| Salmon Site, near Lumberton, Mississippi {{coord|31.14229|-89.57001|name=Sterling|display=inline}}

| {{sort|000000|}}{{convert|74|m|abbr=on}} – {{convert|830|m|abbr=on}}

| underground shaft,
joint verification

|

| style="text-align:center;" | {{sort|000003800|380 t}}

|

|

| Project Vela Uniform/Dribble. Exploded inside the cavity created by Whetstone/Salmon in Tatum salt dome.

|-

! Sidecar{{anchor|Sidecar}}

| {{dts|1966|12|13}} 17:50:00.04

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U3ez {{coord|37.03478|-116.00751|name=Sidecar|display=inline}}

| {{sort|000954|}}{{convert|1195|m|abbr=on}} – {{convert|240.27|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000010000|1 kt}}

| Venting detected on site, {{convert|0.041|Ci|GBq|abbr=on}}

|

|

|-

! New Point{{anchor|New Point}}

| {{dts|1966|12|13}} 21:00:00.08

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U11c {{coord|36.8772|-115.93875|name=New Point|display=inline}}

| {{sort|000759|}}{{convert|1003|m|abbr=on}} – {{convert|243.84|m|abbr=on}}

| underground shaft,
weapon effect

|

| style="text-align:center;" | {{sort|000070000|7 kt}}

| Venting detected on site, {{convert|3|Ci|GBq|abbr=on}}

|

|

|-

! Greeley{{anchor|Greeley}}

| {{dts|1966|12|20}} 15:30:00.08

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U20g - {{coord|37.30231|-116.40966|name=Greeley|display=inline}}

| {{sort|000730|}}{{convert|1945|m|abbr=on}} – {{convert|1214.63|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|008700000|870 kt}}

|

|

| Test of Spartan warhead (W71).{{Cite report| author = Robert McNamara| title = Production and Deployment of the Nike-X| series = Secretary of Defense McNamara Memorandum for the President| accessdate = 2022-06-24| date = 1966-12-02| url = https://nsarchive2.gwu.edu/nukevault/ebb281/4A.pdf| page = 24| archive-date = January 21, 2022| archive-url = https://web.archive.org/web/20220121005834/https://nsarchive2.gwu.edu/nukevault/ebb281/4A.pdf| url-status = live}}

|-

! Rivet 1{{anchor|Rivet 1}}

| {{dts|1967|1|18}} 14:55:00.0

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U10aa {{coord|37.16507|-116.04742|name=Rivet 1|display=inline}}

| {{sort|001123|}}{{convert|1276|m|abbr=on}} – {{convert|152.1|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000001500|150 t}}

|

|

|

|-

! Nash{{anchor|Nash}}

| {{dts|1967|1|19}} 16:45:00.14

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U2ce {{coord|37.1437|-116.13619|name=Nash|display=inline}}

| {{sort|001061|}}{{convert|1425|m|abbr=on}} – {{convert|363.78|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000390000|39 kt}}

| Venting detected off site, {{convert|69|kCi|TBq|abbr=on}}

|

|

|-

! Bourbon{{anchor|Bourbon}}

| {{dts|1967|1|20}} 17:40:04.41

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U7n {{coord|37.09981|-116.0047|name=Bourbon|display=inline}}

| {{sort|000746|}}{{convert|1306|m|abbr=on}} – {{convert|559.72|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000410000|41 kt}}

|

|

|

|-

! Rivet 2{{anchor|Rivet 2}}

| {{dts|1967|1|26}} 16:30:00.0

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U10z {{coord|37.16475|-116.04893|name=Rivet 2|display=inline}}

| {{sort|001076|}}{{convert|1274|m|abbr=on}} – {{convert|197.78|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000008000|800 t}}

| Venting detected on site, {{convert|0.1|Ci|GBq|abbr=on}}

|

|

|-

! Ward{{anchor|Ward}}

| {{dts|1967|2|8}} 15:15:00.13

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U10x {{coord|37.16748|-116.04801|name=Ward|display=inline}}

| {{sort|001019|}}{{convert|1277|m|abbr=on}} – {{convert|257.25|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000110000|11 kt}}

|

|

|

|-

! Persimmon{{anchor|Persimmon}}

| {{dts|1967|2|23}} 18:34:00.04

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U3dn {{coord|37.01756|-116.01662|name=Persimmon|display=inline}}

| {{sort|000884|}}{{convert|1184|m|abbr=on}} – {{convert|299.11|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000040000|4 kt}}

|

|

|

|-

! Agile{{anchor|Agile}}

| {{dts|1967|2|23}} 18:50:00.13

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U2v {{coord|37.12681|-116.06726|name=Agile|display=inline}}

| {{sort|000538|}}{{convert|1270|m|abbr=on}} – {{convert|731.52|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|002000000|200 kt}}

|

|

|

|-

! Rivet 3{{anchor|Rivet 3}}

| {{dts|1967|3|2}} 15:00:00.0

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U10y {{coord|37.16581|-116.04957|name=Rivet 3|display=inline}}

| {{sort|001003|}}{{convert|1275|m|abbr=on}} – {{convert|271.27|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000025000|2.5 kt}}

| Venting detected

|

|

|-

! Mushroom{{anchor|Mushroom}}

| {{dts|1967|3|3}} 15:19:00.04

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U3ef {{coord|37.03946|-116.01093|name=Mushroom|display=inline}}

| {{sort|001018|}}{{convert|1198|m|abbr=on}} – {{convert|179.55|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000006000|600 t}}

| Venting detected on site, {{convert|0.4|Ci|GBq|abbr=on}}

|

|

|-

! Fizz{{anchor|Fizz}}

| {{dts|1967|3|10}} 15:00:00.04

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U3fr {{coord|37.04612|-116.03073|name=Fizz|display=inline}}

| {{sort|001081|}}{{convert|1199|m|abbr=on}} – {{convert|117.73|m|abbr=on}}

| underground shaft,
safety experiment

|

| style="text-align:center;" | {{sort|000000000|less than 20 kt}}

|

|

|

|-

! Oakland{{anchor|Oakland}}

| {{dts|1967|4|4}} 14:20:00.15

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U2bi {{coord|37.16195|-116.08313|name=Oakland|display=inline}}

| {{sort|001155|}}{{convert|1321|m|abbr=on}} – {{convert|165.35|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000000000|less than 20 kt}}

| Venting detected, {{convert|100|Ci|GBq|abbr=on}}

|

|

|-

! Heilman{{anchor|Heilman}}

| {{dts|1967|4|6}} 15:00:00.12

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U2cg {{coord|37.13728|-116.13355|name=Heilman|display=inline}}

| {{sort|001252|}}{{convert|1405|m|abbr=on}} – {{convert|152.7|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000000000|less than 20 kt}}

| Venting detected on site, {{convert|8|Ci|GBq|abbr=on}}

|

|

|-

! Fawn{{anchor|Fawn}}

| {{dts|1967|4|7}} 15:00:00.04

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U3eo {{coord|37.05439|-116.02296|name=Fawn|display=inline}}

| {{sort|000934|}}{{convert|1206|m|abbr=on}} – {{convert|271.06|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000010000|1 kt}}

|

|

|

|-

! Chocolate{{anchor|Chocolate}}

| {{dts|1967|4|21}} 15:09:00.04

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U3es {{coord|37.01928|-116.03818|name=Chocolate|display=inline}}

| {{sort|000945|}}{{convert|1186|m|abbr=on}} – {{convert|240.45|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000070000|7 kt}}

|

|

|

|-

! Effendi{{anchor|Effendi}}

| {{dts|1967|4|27}} 14:45:00.0

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U2ap {{coord|37.13873|-116.06407|name=Effendi|display=inline}}

| {{sort|001059|}}{{convert|1279|m|abbr=on}} – {{convert|219.29|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000008000|800 t}}

|

|

|

|-

! Mickey{{anchor|Mickey}}

| {{dts|1967|5|10}} 13:40:00.041

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U7m {{coord|37.07781|-115.99617|name=Mickey|display=inline}}

| {{sort|000778|}}{{convert|1278|m|abbr=on}} – {{convert|499.63|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000220000|22 kt}}

|

|

|

|-

! Commodore{{anchor|Commodore}}

| {{dts|1967|5|20}} 15:00:00.2

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U2am {{coord|37.13011|-116.0652|name=Commodore|display=inline}}

| {{sort|000524|}}{{convert|1271|m|abbr=on}} – {{convert|746.46|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|002500000|250 kt}}

| Venting detected, less than {{convert|1|Ci|GBq|abbr=on}}

|

|

|-

! Scotch{{anchor|Scotch}}

| {{dts|1967|5|23}} 14:00:00.04

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U19as {{coord|37.27503|-116.37086|name=Scotch|display=inline}}

| {{sort|001056|}}{{convert|2034|m|abbr=on}} – {{convert|977.39|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|001550000|155 kt}}

|

|

|

|-

! Absinthe{{anchor|Absinthe}}

| {{dts|1967|5|26}} 12:30:00.03

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U3ep {{coord|37.045|-116.01979|name=Absinthe|display=inline}}

| {{sort|001080|}}{{convert|1199|m|abbr=on}} – {{convert|118.65|m|abbr=on}}

| underground shaft,
safety experiment

|

| style="text-align:center;" | {{sort|000000000|less than 20 kt}}

|

|

|

|-

! Knickerbocker{{anchor|Knickerbocker}}

| {{dts|1967|5|26}} 15:00:01.5

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U20d {{coord|37.24789|-116.48106|name=Knickerbocker|display=inline}}

| {{sort|001247|}}{{convert|1878|m|abbr=on}} – {{convert|630.63|m|abbr=on}}

| underground shaft,
weapons development

|

| style="text-align:center;" | {{sort|000760000|76 kt}}

| Venting detected, {{convert|110|Ci|GBq|abbr=on}}

|

|

|-

! Switch{{anchor|Switch}}

| {{dts|1967|6|22}} 13:10:00.0

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U9bv {{coord|37.12551|-116.02954|name=Switch|display=inline}}

| {{sort|000975|}}{{convert|1277|m|abbr=on}} – {{convert|301.75|m|abbr=on}}

| underground shaft,
peaceful research

|

| style="text-align:center;" | {{sort|000031000|3.1 kt}}

| Venting detected off site, less than {{convert|1|Ci|GBq|abbr=on}}

|

| Project Plowshare - evaluate clean nuclear explosives for excavation.

|-

! Midi Mist{{anchor|Midi Mist}}

| {{dts|1967|6|26}} 16:00:00.08

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U12n.02 {{coord|37.20206|-116.20871|name=Midi Mist|display=inline}}

| {{sort|001825|}}{{convert|2200|m|abbr=on}} – {{convert|374.9|m|abbr=on}}

| tunnel,
weapon effect

|

| style="text-align:center;" | {{sort|000200000|20 kt}}

| Venting detected, {{convert|4.5|kCi|TBq|abbr=on}}

|

|

|-

! Umber{{anchor|Umber}}

| {{dts|1967|6|29}} 11:25:00.04

| style="text-align:center;" | PST (–8 hrs)
|| NTS Area U3em {{coord|37.02849|-116.0233|name=Umber|display=inline}}

| {{sort|000877|}}{{convert|1188|m|abbr=on}} – {{convert|310.24|m|abbr=on}}

| underground shaft,
weapon effect

|

| style="text-align:center;" | {{sort|000100000|10 kt}}

| Venting detected off site, {{convert|26|kCi|TBq|abbr=on}}

|

|

|}

{{reflist|group=note}}

References

{{reflist|refs=

{{citation| last1=Yang| first1=Xiaoping| first2=Robert| last2=North| first3=Carl| last3=Romney| date=August 2000| title=CMR Nuclear Explosion Database (Revision 3)| publisher=SMDC Monitoring Research}}

{{citation| publisher=Sandia National Laboratories| date=July 1, 1994| title=Official list of underground nuclear explosions| url=http://nuclearweaponarchive.org/Usa/Tests/Nevada.html| access-date=December 18, 2013}}

{{citation| publisher=DOE Nevada Operations Office| date=August 1996| title=Radiological Effluents Released from U.S. Continental Tests 1961 Through 1992 (DOE/NV-317 Rev. 1)| url=http://www.nv.doe.gov/library/publications/historical/DOENV_317.pdf| access-date=October 31, 2013| url-status=dead| archive-url=https://web.archive.org/web/20131103041622/http://www.nv.doe.gov/library/publications/historical/DOENV_317.pdf| archive-date=November 3, 2013}}

{{citation| url=http://www.cancer.gov/i131/fallout/Chapter2.pdf| access-date=January 5, 2014| title=Estimated exposures and thyroid doses received by the American people from Iodine-131 in fallout following Nevada atmospheric nuclear bomb tests, Chapter 2| publisher=National Cancer Institute| year=1997| archive-date=December 21, 2010| archive-url=https://web.archive.org/web/20101221175816/http://www.cancer.gov/i131/fallout/Chapter2.pdf| url-status=dead}}

{{citation| publisher=Department of Energy, Nevada Operations Office| date=December 1, 2000| title=United States Nuclear Tests: July 1945 through September 1992| type=DOE/NV-209 REV15| location=Las Vegas, NV| url=http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf| access-date=December 18, 2013| url-status=dead| archive-url=https://web.archive.org/web/20061012160826/http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf| archive-date=October 12, 2006}}

{{citation| last=Bolt| first=Bruce A.| year=1976| title=Nuclear Explosions and Earthquakes: The Parted Veil| publisher=W.H. Freeman and Co.| location=San Francisco, CA}}

{{citation| last1=Hechanova| first1=Anthony E.| first2=James E.| last2=O'Donnell| date=September 25, 1998| title=Estimates of yield for nuclear tests impacting the groundwater at the Nevada Test Site| publisher=Nuclear Science and Technology Division}}

{{citation| last1=Norris| first1=Robert Standish| first2=Thomas B.| last2=Cochran| date=February 1, 1994| title=United States nuclear tests, July 1945 to 31 December 1992 (NWD 94-1)| journal=Nuclear Weapons Databook Working Paper| publisher=Natural Resources Defense Council| location=Washington, DC| url=http://docs.nrdc.org/nuclear/files/nuc_02019401a_121.pdf| access-date=October 26, 2013| url-status=dead| archive-url=https://web.archive.org/web/20131029194805/http://docs.nrdc.org/nuclear/files/nuc_02019401a_121.pdf| archive-date=October 29, 2013}}

}}

{{US Nuclear Tests}}

Category:Explosions in 1966

Category:Explosions in 1967

Category:1966 in military history

Category:1967 in military history

Latchkey

Category:1966 in the United States

Category:1967 in the United States