The Sen Toku class submarines of the Imperial Japanese Navy were submarine aircraft carriers, each able to carry 3 Aichi Seiran aircraft underwater to their destinations, as well as torpedoes for close range combat.
Red October The Typhoon-class submarine is a ballistic missile-carrying, nuclear-powered submarine (SSBN) deployed by the Soviet Navy in the With a displacement of up to tons, the Typhoon is the largest submarine class in the world ever built.
15 in battlecruiser HMS Hood - already under construction by the time of the 3 battlecruiser disasters at Jutland in 1916, 4000 extra tons of armour were worked into her as a result. This increased her full load draft by over 4 feet, and consequently she was always a notoriously wet ship ('the Fleet's largest submarine'). The extra protection did her little good when confronted by modern German battleship Bismarck in May 1941: there were only 3 survivors.