The submarines were a part of the Japanese Sen Toku I-400-class submarine, which could have easily been two of the most legendary submarines of WW2. Unlike Japan's dwarf submarines of World War II ...

This time, all belligerents fielded substantial submarine fleets. The era's largest was Japan's I-400 class. Known as the Sen Toku, these subs measured 400 feet long, 39 feet wide, and 23 feet ...

Japan began construction of the 5,223-ton I-400 class of submarine aircraft carrier. Designed for attacks against the Panama Canal and the U.S. west coast, each carried three dive-bomber seaplanes.