MOSCOW—Russia has released previously classified footage of the world’s largest nuclear explosion, caused when the Soviet Union detonated the so-called Tsar Bomba almost 60 years ago.
The hydrogen bomb, which carried the force of 50 million tons of conventional explosives, was detonated in a test in Oct. 1961, just over 13,000 feet over the remote Novaya Zemlya archipelago above the Arctic Circle.
