The Trinity test was something of a moment of truth for the scientists and engineers behind the Manhattan project, and while Oppenheimer is getting the movie, the person that's most directly responsible for making the gadget work was the explosives experts who developed the implosion system.

Making an implosion successfully compress the pit required an understanding of explosion dynamics that simply didn't exist before it was studied at Los Alamos. And making it work required some hand tweaking, right down to the head of XDivision manually drilling out and filling air bubbles using a dentist drill.

And then the detonation system used technology which had been developed to take photographs.

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