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  • September 1, 1952 - A second U.S. nuclear weapons laboratory is established in Livermore, California.
  • September 8, 1977 - A Soviet Delta class nuclear-powered ballistic missile submarine accidentally jettisons a nuclear warhead near Kamchatka in the Pacific. The bomb is recovered.
  • September 22, 1979 - A nuclear explosion occurs over the South Indian Ocean off the Cape of Good Hope, possibly conducted by South Africa with the assistance of Israel.
  • September 26, 1983 - Stanislav Petrov, a lieutenant colonel in the Soviet Air Defense Forces, was sitting in the commander's chair inside the secret bunker at Serpukhov-15. An early-warning alarm went off, indicating that a nuclear attack from the United States was on the way. Petrov followed his gut feeling that this was a false alarm, and went against protocol by not initiating a nuclear counter-attack.The false alarm was eventually determined to be due to an early-warning satellite mistaking the sun's reflection off of clouds for a missile launch.
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