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Little Boy (the atomic bomb used on Hiroshima) was a design that was EXTREMELY prone to accidental detonation. An accident could easily have driven the two pieces of uranium in the bomb together and caused a nuclear detonation, or at best a major criticality accident with absolutely massive radiation release. And that's the best-case scenario. The worst-case scenario would have been a detonation large enough to destroy the B-29 base on Tinian.
What would happen if one of the above happens? How does the USAAF cover up this humongous disaster? What airfields do they use to stage Fat Man from?