A mushroom cloud rises after the so-called Tsar Bomba was detonated in a test over the remote Novaya Zemlya archipelago in USSR, in this still image from previously classified footage taken in October 1961 and released by Russian state atomic energy corporation Rosatom. Ministry of medium machine building of USSR/Russian state atomic energy corporation Rosatom/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. NO RESALES. NO ARCHIVES. MANDATORY CREDIT.
MOSCOW (Reuters) - 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 October 1961, 4,000 metres over the remote Novaya Zemlya archipelago above the Arctic Circle.
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