MrBuddy
The intro to the video is a little off. The bomb (Operation: Plumbbob's John test) detonated between 18,000 and 20,000 feet above sea level. I'm not sure how high the Nevada Test Site is. The yield was less than 2 kilotons, at 1.5 kilotons or one tenth the size of the Hiroshima bomb. I suppose you could call were they were standing Ground Zero, but it would be more honest if you mentioned the bomb detonated at least two miles away (if you count up as being away). The guys you see in the video got no significant dose of gamma or neutron radiation. The idea was they were going to show that atomic bombs were safe to use above cities. They didn't mention the radioactive fallout which drifted down long after those guys had left.