Nuclear bombing

I knew that the Japanese recognized the weapon immediately.

I hadn't heard that their intelligence was adept enough that they knew about the Trinity test, and knew that and when B29s of a special task force were coming. Both times.

Assuming this documentary is true, of course... I speak no Japanese and am not expert on their WWII history. (As far as I know this could be the product of the Japanese equivalent of The History Channel.)

It might be simply the usual hindsight, where the one guy turns out to be right after all.