Tsar Bomba, Soviet thermonuclear bomb that was detonated in a test over Novaya Zemlya island in the Arctic Ocean on October 30, 1961. The largest nuclear weapon ever set off, it produced the most powerful human-made explosion ever recorded.

The 1961 documentary of the preparation, transportation, and delivery of the bomb to the target site lasts 29 min minutes. The documentary concludes with video observations from near and afar of the most powerful human-made explosion ever recorded. May such a device NEVER be used in war. Russian Language, English subtitles.

(The video runs 40 min but the last 11 minutes is not relevant)

https://www.youtube.com/watch?v=XJhZ3i-HXS0