Comment by sandworm101
5 hours ago
I suspect the actual first frames are still classified as they likely evidence detonator tech/performance. So the real first moments of the nuclear age will never be shown. (The high-speed cameras would have started filming shortly before the blast.)
I doubt that there’s anything that’s been classified in a long time in 80-year-old footage of tech that’s well understood by any interested party. Fission weapons are rather trivial to manufacture, the bottleneck has always been access to high-purity fissile material. Hydrogen bombs OTOH involve a lot of classified stuff.
I think Peter Kuran has said that the majority of interesting footage is neglected rather than classified. He specializes in X-ray photos of the first few milliseconds.