The Soviet Union's 1966 nuclear test series was a group of 18 nuclear tests conducted in 1966. These testsA bomb test may be a salvo test, defined as two or more explosions "where a period of time between successive individual explosions does not exceed 5 seconds and where the burial points of all explosive devices can be connected by segments of straight lines, each of them connecting two burial points and does not exceed 40 kilometers in length". followed the 1965 Soviet nuclear tests series and preceded the 1967 Soviet nuclear tests series.

+ Soviet Union's 1966 series tests and detonations 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. Date time (UT) 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: 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. 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. 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. 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. YieldEstimated energy yield in tons, kilotons, and megatons. A ton of TNT equivalent is defined as 4.184 gigajoules (1 gigacalorie). 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. References Notes 245 04:58:00.1 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: E-1 – tunnel,peaceful research

Highest yield shaft test at Semipalatinsk. 246 05:50:00.3 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: 11 – tunnel,weapons development

247 03:58:00.1 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: A-4p + tunnel,peaceful research

248 Galit A1 (Halite) 02:58:00.3 SHET (5 hrs) Atyrau, Kazakhstan: A-I – underground shaft,cavity excavation

Venting detected

Cavity production in rock salt. 249 03:58:00.2 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: 25 + tunnel,peaceful research

250 06:58:00.5 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: Z-6 + tunnel,peaceful research

251 03:58:00.0 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: 24 + tunnel,weapons development

252 03:57:59.6 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: 17 + tunnel,weapons development

253 03:52:59.9 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: Z-1p + tunnel,peaceful research

254 03:51:59.7 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: Zh-1p + tunnel,fundamental science

255 Urta-Bulak 05:59:51.0 SAMT (5 hrs) Bukhara, Uzbekistan: 1-s – underground shaft,extinguishing oil/gas fires

Gas fire shaft closure. 256 03:57:59.9 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: 13 + tunnel,weapons development

258 05:57:58.1 MSK (3 hrs) NZ Area B, Matochkin Shar, Novaya Zemlya, Russia: A-2 – tunnel,weapons development

R-27 (ballistic missile) Warhead Venting detected off site,

257 06:00:?? MSK (3 hrs) NZ Area B, Matochkin Shar, Novaya Zemlya, Russia: A-1 + tunnel,weapons development

R-27 (ballistic missile) Warhead Venting detected off site,

259 03:58:00.0 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: G + tunnel,weapons development

260 03:58:00.0 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: Zh-3p + tunnel,weapons development

261 - 1 05:02:00.2 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: 14 + tunnel,weapons development

261 - 2 05:02:00.2 ALMT (6 hrs) Degelen, Semipalatinsk, Kazakhstan: 14 + tunnel,peaceful research

262 04:58:00.0 ALMT (6 hrs) Sary-Uzen/Murzhik, Semipalatinsk, Kazakhstan: 101 + underground shaft,peaceful research

Venting detected

References

The official Russian list of Soviet tests.