Specifically, the demon core[1]. It was the core-in-waiting for a third bomb if needed, and I believe that the uranium and plutonium production lines were ram

Specifically, the demon core[1]. It was the core-in-waiting for a third bomb if needed, and I believe that the uranium and plutonium production lines were ramping up by that time[2]. [1] https://en.wikipedia.org/wiki/Demon_core https://en.wikipedia.org/wiki/Demon_core [2] https://www.atomicheritage.org/history/timeline https://www.atomicheritage.org/history/timeline search for 1945 July 23 entry.