<p>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.</p>.<p>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.</p>.<p>The footage shows an immense fireball and a 60-km high mushroom cloud rising after the explosion lit up the sky. The views were captured from several angles by cameras installed on the ground and onboard two Soviet aircraft.</p>.<p>"The testing of an exceptionally powerful hydrogen load... confirmed that the Soviet Union is in possession of a thermonuclear weapon with the power of 50 megatons, 100 megatons and more," a narrator tells the audience.</p>.<p>The documentary was published online for the first time by Russian state nuclear agency Rosatom last week as part of events to mark 75th anniversary of Russia's atomic industry.</p>.<p>Developed between 1956 and 1961 as the Soviet Union engaged in a nuclear arms race with the United States, the Tsar Bomba — the King of Bombs — was the largest hydrogen bomb ever and was claimed to be 3,300 times as destructive as the weapon that levelled Hiroshima.</p>.<p>The 30-minute film, which opens with a 'Top secret' title, features all the test stages — from the transportation of a 26-ton weapon in an aviation bomb casing by railway to post-explosion measurements of the radioactive fallout.</p>.<p>The Tsar Bomba far surpassed the largest explosion the United States has ever conducted — a 15-megaton "Castle Bravo" hydrogen bomb detonated on Bikini Atoll in 1954.</p>
<p>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.</p>.<p>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.</p>.<p>The footage shows an immense fireball and a 60-km high mushroom cloud rising after the explosion lit up the sky. The views were captured from several angles by cameras installed on the ground and onboard two Soviet aircraft.</p>.<p>"The testing of an exceptionally powerful hydrogen load... confirmed that the Soviet Union is in possession of a thermonuclear weapon with the power of 50 megatons, 100 megatons and more," a narrator tells the audience.</p>.<p>The documentary was published online for the first time by Russian state nuclear agency Rosatom last week as part of events to mark 75th anniversary of Russia's atomic industry.</p>.<p>Developed between 1956 and 1961 as the Soviet Union engaged in a nuclear arms race with the United States, the Tsar Bomba — the King of Bombs — was the largest hydrogen bomb ever and was claimed to be 3,300 times as destructive as the weapon that levelled Hiroshima.</p>.<p>The 30-minute film, which opens with a 'Top secret' title, features all the test stages — from the transportation of a 26-ton weapon in an aviation bomb casing by railway to post-explosion measurements of the radioactive fallout.</p>.<p>The Tsar Bomba far surpassed the largest explosion the United States has ever conducted — a 15-megaton "Castle Bravo" hydrogen bomb detonated on Bikini Atoll in 1954.</p>