The Sen Toku-class I-401 (伊四百型潜水艦) 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.
U-Boot Typ VII/D
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USS Silversides - world war II submarine -Muskegon, MI. We spent a night on the submarine years ago, very cool experience.
Russian biggest submarine class Typhoon or Akula ..-
Submarine Warfare of World War II rare documentary - YouTube