Originally Posted by Zucchini
The Japanese physicists were trying to explain why Hiroshima couldn't duplicated by the Americans even after Nagasaki. Perhaps they believed nobody could be farther along in development of an atom bomb than the Germans.
Yes, the Japanese badly underestimated the US's capabilities and the nuclear program was among their worst under-estimations. The day before Japan surrendered, President Truman signed the document to drop the third atomic bomb! Also the USA planned to use another 'nine' atomic bombs during the invasion of the Japanese home islands.