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See also: List of nuclear weapons tests of the United States
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Operation Toggle
Information
Country United States
Period 1972–1973
Number of tests 28
Test type underground shaft, tunnel
Max. yield 250 kilotonnes of TNT (1,000 TJ)
NTS - Underground Testing 006
Toggle Diamond Sculls tunnel test chamber

The United States's Toggle nuclear test series was a group of 28 nuclear tests conducted in 1972–1973. These tests followed the Operation Grommet series and preceded the Operation Arbor series.

United States' Toggle series tests and detonations
Name Date time (UT) Local time zone Location Elevation + height Delivery
Purpose		 Device Yield Fallout References Notes
Diamond Sculls July 20, 1972 17:16:00.16 PST (–8 hrs)
 NTS Area U12t.02 37°12′52″N 116°11′02″W / 37.21439°N 116.18382°W / 37.21439; -116.18382 (Diamond Sculls) 2,113 m (6,932 ft) – 419.4 m (1,376 ft) tunnel,
weapon effect		 21 kt
Atarque July 25, 1972 13:30:00.06 PST (–8 hrs)
 NTS Area U3ht 37°00′45″N 116°00′57″W / 37.01247°N 116.01577°W / 37.01247; -116.01577 (Atarque) 1,182 m (3,878 ft) – 294.2 m (965 ft) underground shaft,
weapons development		 1.5 kt Venting detected
Cebolla – 1 (with Cuchillo,Solano) August 9, 1972 13:31:10.04 PST (–8 hrs)
 NTS Area U3jc 37°00′26″N 116°01′11″W / 37.00717°N 116.01976°W / 37.00717; -116.01976 (Cebolla – 1) 1,180 m (3,870 ft) – 287 m (942 ft) underground shaft,
weapons development		 less than 5 kt Venting detected Simultaneous, separate holes.
Cuchillo – 2 (with Cebolla, Solano) August 9, 1972 13:31:10.04 PST (–8 hrs)
 NTS Area U3jt 37°00′13″N 116°01′11″W / 37.00373°N 116.01982°W / 37.00373; -116.01982 (Cuchillo – 2) 1,179 m (3,868 ft) – 198.81 m (652.3 ft) underground shaft,
weapons development		 less than 5 kt Simultaneous, separate holes.
Solano – 3 (with Cebolla,Cuchillo August 9, 1972 13:31:10.04 PST (–8 hrs)
 NTS Area U3jx 37°00′11″N 116°01′03″W / 37.00315°N 116.01757°W / 37.00315; -116.01757 (Solano – 3) 1,179 m (3,868 ft) + underground shaft,
safety experiment		 less than 5 kt Simultaneous, separate holes.
Oscuro September 21, 1972 15:30:00.19 PST (–8 hrs)
 NTS Area U7z 37°04′55″N 116°02′15″W / 37.08201°N 116.03742°W / 37.08201; -116.03742 (Oscuro) 1,225 m (4,019 ft) – 560.21 m (1,838.0 ft) underground shaft,
weapons development		 160 kt
Delphinium September 26, 1972 14:30:00.16 PST (–8 hrs)
 NTS Area U2dp 37°07′17″N 116°05′12″W / 37.12135°N 116.08667°W / 37.12135; -116.08667 (Delphinium) 1,276 m (4,186 ft) – 295.66 m (970.0 ft) underground shaft,
weapons development		 15 kt
Akbar November 9, 1972 15:15:00.16 PST (–8 hrs)
 NTS Area U10ax 37°09′43″N 116°02′03″W / 37.16202°N 116.03405°W / 37.16202; -116.03405 (Akbar) 1,295 m (4,249 ft) – 267 m (876 ft) underground shaft,
weapons development		 600 t
Arsenate November 9, 1972 18:15:00.16 PST (–8 hrs)
 NTS Area U9ci 37°07′17″N 116°02′00″W / 37.12151°N 116.03326°W / 37.12151; -116.03326 (Arsenate) 1,268 m (4,160 ft) – 250.24 m (821.0 ft) underground shaft,
weapons development		 600 t Venting detected, 12 Ci (440 GBq)
Canna-Limoges – 2 November 17, 1972 18:00:00.16 PST (–8 hrs)
 NTS Area U9itsyz26 37°08′22″N 116°02′00″W / 37.13953°N 116.03324°W / 37.13953; -116.03324 (Canna-Limoges – 2) 1,273 m (4,177 ft) + underground shaft,
safety experiment		 less than 20 kt Simultaneous, same hole.
Canna-Umbrinus – 1 November 17, 1972 18:00:00.16 PST (–8 hrs)
 NTS Area U9itsyz2 37°08′22″N 116°02′00″W / 37.13953°N 116.03324°W / 37.13953; -116.03324 (Canna-Umbrinus – 1) 1,273 m (4,177 ft) – 213.36 m (700.0 ft) underground shaft,
weapons development		 less than 20 kt Simultaneous, same hole.
Tuloso December 12, 1972 16:30:00.04 PST (–8 hrs)
 NTS Area U3gi 37°01′53″N 116°01′19″W / 37.03128°N 116.02196°W / 37.03128; -116.02196 (Tuloso) 1,189 m (3,901 ft) – 271.09 m (889.4 ft) underground shaft,
weapons development		 200 t
Solanum December 14, 1972 15:30:00.16 PST (–8 hrs)
 NTS Area U9itsw24 37°08′17″N 116°02′08″W / 37.13804°N 116.03559°W / 37.13804; -116.03559 (Solanum) 1,267 m (4,157 ft) – 201.17 m (660.0 ft) underground shaft,
weapons development		 less than 20 kt Venting detected
Flax-Source December 21, 1972 20:15:00.24 PST (–8 hrs)
 NTS Area U2dj 37°08′24″N 116°05′03″W / 37.13997°N 116.08415°W / 37.13997; -116.08415 (Flax-Source) 1,296 m (4,252 ft) – 440 m (1,440 ft) underground shaft,
weapons development		 20 kt
Flax-Backup – 2 December 21, 1972 20:15:24.35 PST (–8 hrs)
 NTS Area U2dj 37°08′24″N 116°05′03″W / 37.13997°N 116.08415°W / 37.13997; -116.08415 (Flax-Backup – 2) 1,296 m (4,252 ft) + underground shaft,
weapon effect		 less than 20 kt
Flax-Test – 1 December 21, 1972 20:15:24.35 PST (–8 hrs)
 NTS Area U2dj 37°08′24″N 116°05′03″W / 37.13997°N 116.08415°W / 37.13997; -116.08415 (Flax-Test – 1) 1,296 m (4,252 ft) – 688.85 m (2,260.0 ft) underground shaft,
weapon effect		 20 kt
Alumroot February 14, 1973 15:30:00.16 PST (–8 hrs)
 NTS Area U9cj 37°08′49″N 116°03′03″W / 37.14704°N 116.05096°W / 37.14704; -116.05096 (Alumroot) 1,264 m (4,147 ft) – 182.88 m (600.0 ft) underground shaft,
weapons development		 less than 20 kt
Miera March 8, 1973 16:10:00.19 PST (–8 hrs)
 NTS Area U7ad 37°06′13″N 116°01′39″W / 37.10354°N 116.02759°W / 37.10354; -116.02759 (Miera) 1,279 m (4,196 ft) – 568.39 m (1,864.8 ft) underground shaft,
weapons development		 67 kt I-131 venting detected, 0
Gazook March 23, 1973 20:15:00.17 PST (–8 hrs)
 NTS Area U2do 37°07′02″N 116°05′16″W / 37.11727°N 116.08779°W / 37.11727; -116.08779 (Gazook) 1,274 m (4,180 ft) – 326.14 m (1,070.0 ft) underground shaft,
weapons development		 200 t Venting detected, 12 Ci (440 GBq)
Natoma April 5, 1973 14:50:00.16 PST (–8 hrs)
 NTS Area U10aw 37°10′40″N 116°03′17″W / 37.17783°N 116.05476°W / 37.17783; -116.05476 (Natoma) 1,283 m (4,209 ft) – 243.84 m (800.0 ft) underground shaft,
weapons development		 less than 20 kt
Angus – 1 (with Velarde) April 25, 1973 22:25:00.03 PST (–8 hrs)
 NTS Area U3jg 37°00′17″N 116°01′45″W / 37.00483°N 116.0292°W / 37.00483; -116.0292 (Angus – 1) 1,180 m (3,870 ft) – 452.63 m (1,485.0 ft) underground shaft,
weapons development		 9 kt Venting detected, 0.6 Ci (22 GBq) Simultaneous, separate holes.
Velarde – 2 (with Angus) April 25, 1973 22:25:00.07 PST (–8 hrs)
 NTS Area U3jk 36°59′37″N 116°01′18″W / 36.99367°N 116.02173°W / 36.99367; -116.02173 (Velarde – 2) 1,176 m (3,858 ft) – 277 m (909 ft) underground shaft,
weapons development		 8 kt Venting detected, 250 Ci (9,200 GBq) Simultaneous, separate holes.
Colmor April 26, 1973 15:15:00.04 PST (–8 hrs)
 NTS Area U3hv 37°00′44″N 116°01′15″W / 37.01214°N 116.0207°W / 37.01214; -116.0207 (Colmor) 1,182 m (3,878 ft) – 245.81 m (806.5 ft) underground shaft,
weapons development		 500 t Venting detected
Starwort April 26, 1973 17:15:00.16 PST (–8 hrs)
 NTS Area U2bs 37°07′23″N 116°03′34″W / 37.12301°N 116.05937°W / 37.12301; -116.05937 (Starwort) 1,261 m (4,137 ft) – 563.88 m (1,850.0 ft) underground shaft,
weapons development		 90 kt Venting detected, 10 Ci (370 GBq)
Mesita May 9, 1973 13:30:00.04 PST (–8 hrs)
 NTS Area U3jd 37°00′23″N 116°01′01″W / 37.00626°N 116.01681°W / 37.00626; -116.01681 (Mesita) 1,180 m (3,870 ft) – 149.25 m (489.7 ft) underground shaft,
weapons development		 less than 20 kt Venting detected
Rio Blanco – 1 May 17, 1973 16:00:00.12 MST (–7 hrs)
 near Rifle, Colorado 39°47′36″N 108°22′02″W / 39.79322°N 108.3672°W / 39.79322; -108.3672 (Rio Blanco – 1) 1,938 m (6,358 ft) – 1,758 m (5,768 ft) underground shaft,
peaceful research		 33 kt Operation Plowshare – AEC/Gas industry enhancement experiment. Simultaneous, same hole.
Rio Blanco – 2 May 17, 1973 16:00:00.12 MST (–7 hrs)
 near Rifle, Colorado 39°47′36″N 108°22′02″W / 39.79322°N 108.3672°W / 39.79322; -108.3672 (Rio Blanco – 2) 1,938 m (6,358 ft) – 1,875 m (6,152 ft) underground shaft,
peaceful research		 33 kt Project Plowshare – AEC/Gas industry enhancement experiment. Simultaneous, same hole.
Rio Blanco – 3 May 17, 1973 16:00:00.12 MST (–7 hrs)
 near Rifle, Colorado 39°47′36″N 108°22′02″W / 39.79322°N 108.3672°W / 39.79322; -108.3672 (Rio Blanco – 3) 1,938 m (6,358 ft) – 2,015 m (6,611 ft) underground shaft,
peaceful research		 33 kt Project Plowshare – AEC/Gas industry enhancement experiment. Simultaneous, same hole.
Cabresto May 24, 1973 13:30:00.04 PST (–8 hrs)
 NTS Area U7h 37°04′41″N 116°01′54″W / 37.078°N 116.03164°W / 37.078; -116.03164 (Cabresto) 1,228 m (4,029 ft) – 197.89 m (649.2 ft) underground shaft,
weapons development		 15 kt
Kashan May 24, 1973 14:30:00.16 PST (–8 hrs)
 NTS Area U10av 37°09′44″N 116°03′25″W / 37.16222°N 116.05689°W / 37.16222; -116.05689 (Kashan) 1,277 m (4,190 ft) – 265.18 m (870.0 ft) underground shaft,
weapons development		 2 kt Venting detected, 270 Ci (10,000 GBq)
Dido Queen June 5, 1973 17:00:00.17 PST (–8 hrs)
 NTS Area U12e.14 37°11′06″N 116°12′58″W / 37.18498°N 116.21599°W / 37.18498; -116.21599 (Dido Queen) 2,247 m (7,372 ft) – 391.36 m (1,284.0 ft) tunnel,
weapon effect		 18 kt
Almendro June 6, 1973 13:00:00.08 PST (–8 hrs)
 NTS Area U19v – 37°14′42″N 116°20′49″W / 37.245°N 116.34691°W / 37.245; -116.34691 (Almendro) 2,069 m (6,788 ft) – 1,066.52 m (3,499.1 ft) underground shaft,
weapons development		 250 kt
Potrillo June 21, 1973 14:45:00.08 PST (–8 hrs)
 NTS Area U7af 37°05′31″N 116°01′41″W / 37.09199°N 116.02809°W / 37.09199; -116.02809 (Potrillo) 1,255 m (4,117 ft) – 567.02 m (1,860.3 ft) underground shaft,
weapons development		 58 kt Venting detected
Portulaca June 28, 1973 19:15:12.4 PST (–8 hrs)
 NTS Area U2bv 37°08′54″N 116°05′12″W / 37.14837°N 116.08673°W / 37.14837; -116.08673 (Portulaca) 1,311 m (4,301 ft) – 466.34 m (1,530.0 ft) underground shaft,
weapons development		 24 kt I-131 venting detected, 0
Silene June 28, 1973 19:45:00.16 PST (–8 hrs)
 NTS Area U9ck 37°06′53″N 116°02′30″W / 37.11486°N 116.04179°W / 37.11486; -116.04179 (Silene) 1,254 m (4,114 ft) – 198.12 m (650.0 ft) underground shaft,
weapons development		 5 t
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