The IJN I-400 Class submarine finished up being the most submarine in WW ? as well as the largest in the world ahead of the development of nuclear submarines in 1960s.I-400 had sufficient fuel to bypass the planet one . 5 times and could carry 3 Aichi M 6A 1�Seiran� aircraft that might be assembled for journey within seconds. One of their missions, that has been never finished, reportedly should be to make use of the aircraft to drop bacteriological bombs on U.S. urban centers. Nevertheless the bacteriological bombs could not prepare yourself as time passes .Later, a mission would be to bomb the Panama Canal to slice the supply lines of Allied forces but canceled finally. The I-400 and I-401 had been captured at sea per week following Japanese surrendered in 1945.
