Saying it was just an engineering problem is really understating the level of theory and experiment had to happen at the same time. It was a huge scientific and

Saying it was just an engineering problem is really understating the level of theory and experiment had to happen at the same time. It was a huge scientific and engineering endeavor that happened simultaneously. Some good books that go into the crazy intricacies are American Prometheus and The Making of the Atomic Bomb if you are interested.