Rapatronic camera footage from large H-bomb tests that allows you to see nuclear lightning created by the explosions. (Note: these should not be confused with the smoke trails that appear in many/most nuclear test photographs. Notice how quickly they fade away to nothing.) These both look like different versions of Ivy MIKE, the first hydrogen bomb test (November 1952) by the United States. No audio.
More details: How to Make an Atomic Thunderstorm | Restricted Data: the Nuclear Secrecy Blog:
Source: US government-produced footage, taken from this longer video: