Launch of RDS-37 Hydrogen Bomb

Date: November 22, 1955 • Location: Kurchatov, Kazakhstan

The Soviet Union launches RDS-37, a 1.6 megaton two stage hydrogen bomb designed by Andrei Sakharov. The bomb was dropped over Semipalatinsk.

The Soviet Union, officially the Union of Soviet Socialist Republics (USSR), was a transcontinental country that spanned much of Eurasia from its formation in 1922 until its dissolution in 1991. It was the world's third-most populous country, the largest by area, and bordered twelve other countries. A diverse multinational state, it was organized as a federal union of national republics, with the largest and most populous being the Russian Soviet Federative Socialist Republic (SFSR). The world's flagship communist state, it was governed by the Communist Party under Marxism–Leninism, through soviet councils. The Soviet economy was also centrally planned. Its capital and largest city was Moscow.