Housatonic, part of Operation Dominic, was the last-ever, air-dropped US nuclear weapons test. It took place 12,100 feet (3,700m) above Johnston Island in the Pacific, and at 8.3 megatons was more than a thousand times more powerful than Tesla. Here, in the first few hundred frames, you can actually see parts of the bomb casing show up as lighter spots on the face of the expanding fireball.