An I 401 class sub was discovered off Hawaii. The submarine is from the I-400 Sensuikan Toku class of subs, the largest built before the nuclear ballistic missile submarines of the 1960s. They were 400 feet long and nearly 40 feet high and could carry a crew of 144. The submarines were designed to carry three "fold-up" bombers that could be assembled for flight within minutes. "An I-400 and I-401 were captured at sea a week after the Japanese surrendered in 1945. Their mission — which was never completed — reportedly was to use the aircraft to drop rats and insects infected with bubonic plague, cholera, typhus and other diseases on U.S. cities.
When the bacteriological bombs could not be prepared in time, the mission was reportedly changed to bomb the Panama Canal."