Russians released declassified video of the most powerful nuclear bomb ever tested.
 

Found this online, might be of interest for some. The video is in Russian but you can switch on English subtitles.

https://www.youtube.com/watch?v=nbC7BxXtOlo

Frightening stuff and difficult to get a handle on it's destructive power. With that in mind I did some searching and came across the following short video which puts Tsar Bomba into comparison with the atomic bombs dropped on Japan.

https://www.youtube.com/watch?v=xLRSmzGRLUk

I found this surprising watchable (in a terrifying sort of way). Like a factual version of Dr. Strangelove, and just as alien and surreal. Weird, really weird.

In my Army time we were trained to survive and recover from nuclear strikes.

Three things to be aware of

1. Light; very bright, don't look at the explosion.
2. Heat; hot but apparently you could save yourself with a sheet of newspaper held up (I always wondered about my fingers on the wrong side as I held it up)
3. Blast; first effect was air travelling away from the explosion, you dodged this by lying down behind a low wall (high wall was no good because the top would fall down and crush you). Then second effect was air rushing back in, so you had to then leap over the low wall.

Nobody said much about the radiation danger, presumably we were British so it did not affect us.

And you were expected to note and report the "Flash to Bang time" in order to work out how far away it was :ROFL:
I think that that would go like:" What the feck was tha......."

Is that why we had so many broadsheet newspapers? ;)