Aichi M6A1 Seiran (Clear Sky Storm)

Aichi chief engineer, Toshio Ozaki, designed the M6A1 Seiran to fulfill the requirement for a bomber that could operate exclusively from a submarine. Japanese war planners devised the idea as a means for striking directly at the United States mainland and other important strategic targets. This M6A1 was the last airframe built and the only surviving example of the Seiran in the world.