Editor says, what if Imperial Japan developed the super-weapon, on-stream for a later Pacific War? Please note that the opinions expressed in this post do not necessarily reflect the views of the author(s).
Editor says, thanks to David Atwell for his assistance in the development of this post. The source article reads: researchers at the NOAA-funded Hawaii Undersea Research Laboratory [www.soest.hawaii.edu/HURL] have rediscovered two high-tech Japanese submarines off the coast of Oahu, where the U.S. Navy scuttled the vessels in 1946 to prevent their innovative technology from falling into Soviet hands. The smaller vessel, I-201, was a fast-attack sub with a sleek, cutting-edge design believed to have made it twice as fast as contemporary American subs. As with I-14, I-201 remained in harbor when the war ended. The two ships were among a group of five seized by the U.S. Navy and piloted to Hawaii, where military engineers gleaned their secrets before sending the subs to the ocean floor.
Additional Notes from Guest Historian Scott Palter:
1) Note that his POD could be such as revolution in doctrine and practice. The funny part of all this is they had access to the Germans [Axis] and the British [joint service in WW1, Alliance till 1922] so it is not impossible. It merely didn't fit the idiot Bushido Spirit that captured the lower officer ranks 20's/30's.
2) The issue has been argued on H-War for years. Except for one brief period by a few subs off the Australian east coast 1942-43 the IJN simply didn't play the commerce raider game with subs. Indeed a few German/italian subs did more damage out of Malaya than the entire IJN per a few posts by people with decent books to their credit. Editorial comments are entered in [light green] typeface.