The IJN I-400 Class submarine ended up being the greatest submarine in WW ? and also the largest in the world before the growth of nuclear submarines in 1960s.I-400 had enough fuel to bypass the planet one and a half times and was able to carry 3 Aichi M 6A 1�Seiran� aircraft that may be assembled for journey within minutes. Certainly one of their missions, that was never ever completed, reportedly was to utilize the aircraft to drop bacteriological bombs on U.S. metropolitan areas. Nevertheless the bacteriological bombs could not be prepared with time .Later, a mission was to bomb the Panama Canal to cut the supply lines of Allied forces but canceled finally. The I-400 and I-401 had been captured at sea per week after the Japanese surrendered in 1945.
