The 'Sen Toku I-400-class (伊四〇〇型潜水艦) submarines of the Imperial Japanese Navy were the largest submarines of World War II, and remained the largest ever built prior to the development of nuclear ballistic missile submarines in the 1960s. They were submarine aircraft carriers able to carry three Aichi M6A Seiran aircraft underwater to their destinations. They were designed to surface, launch the planes then dive again quickly before they were discovered. They also carried torpedoes for close range combat.


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