I-401

The Sen Toku-class I-401 (伊号第四百一潜水艦) was once the largest submarine in the world. It was commanded by Lieutenant Commander Nobukiyo Nambu of the Imperial Japanese Navy during World War II. Capable of carrying three two-seat Aichi M6A1 "Seiran" (Mountain Haze) float torpedo bombers, the Sen Tokus were built to launch a surprise air strike against the Panama Canal. She calls herself Shioi. While the "shi" and "i" in her name stands for 4 and 1 in Japanese respectively, the "o" in her name is just pronounced as the letter instead of an abbreviation of the number 0. The brainchild of Admiral Isoro...