Videographer had bottoms up view of nuclear blast, lives to tell tale
http://www.foxnews.com/scitech/2012/07/27/how-does-it-feel-to-stand-under-nuclear-bomb/
Granted it was ‘only’ 2 kiloton (or 2,000 tons which is 4,000,000 lbs, according to my math), but 10,000 feet is less than two miles away. Of course, back then people didn’t have the same sort of ‘appreciation’ we have for nuclear energy as we do today.