Shortly before Trinity the Japanese managed to blow up their primary atomic bomb development team in fact. They also had half a dozen or so giant underwater submarines capable of launching a medium range bomber with atom bombs if they'd ever gotten that far, and they are reputed to have manufactured and made ready for battle about 12,000 jet planes.
Although part of the Axis, it would be incorrect to refer to the Japanese as "Nazis". BTW, the Germans shipped some yellow-cake (uranium ore) to the Japanese. It was transferred at sea into one of those giant submarines. That particular sub was finally found near Hawaii about 5 or 6 years ago.
The Germans developed so much new tech that is why everyone was in such a hurry to get all their national intellectual property. Why do you think that we bent over backwards with operation paperclip to get all that knowledge why do you think that Ike made that farewell speech warning us about the industrial military complex? There is so much you don’t know about 2nd world war and what was developed because you have bought the USA legend.