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What if the Trinity Device ("The Gadget") failed to fuse on July 16th, 1945? An error in assembly, a defective component, a lightning strike, take your pick, but at 05:29:45 local, some very carefully designed explosives ALMOST properly compresses a little over 6kg of plutonium into a supercritical mass.

What results is not the world's first man-made nuclear detonation, but the world's first dirty bomb.

What happens next?

USS Indianapolis (CA-35) historically departed San Francisco on the 16th with the core for Little Boy, the Uranium bomb. Scientists had been quite sure this bomb would work, and didn't test it. Does the Trinity failure cause them to re-think this?
Fat Man's core historically was flown to Tinian July 24th. Does it go anyway? Is it used for a 2nd Trinity Test?
Does Truman decide this whole A-Bomb thing is a bust and put Operation Downfall back into the works?
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