energy Joe 1 RDS-37 Soviet atomic bomb project Ivy Mike Castle Bravo Boosted fission weapon References Notes Bibliography External links Soviet and Nuclear Weapons History Soviet/Russian Nuclear Arsenal Video footage of the Joe-4 Nuclear Test Nikolai Bulganin Nuclear bombs of the Soviet Union Soviet nuclear weapons testing Cold War history of the Soviet Union 1953 in the Soviet Union 1953 in military history Explosions in 1953 August 1953 events in Asia