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Alligator was a submarine designed by the French that was deployed during the American Civil War by the Union. It was 47 feet long and four feet in diameter. 1)
With a submerged displacement of 48,000 tonnes, a length of 574ft (175m), and a beam of 75ft (23m), Project-941 Akula class (NATO reporting name Typhoon) nuclear-powered submarines are the largest ever made. They could reach 27 knots (50km/h) while submerged and stay underwater for over 120 days. 2)
They could carry 20 R-39 ballistic missiles, each with 10 nuclear warheads. This means that each (of the six ever built) Typhoon-class submarines were able to sneak to almost any place in the world undetected and launch nuclear warheads to 200 separate targets in a 5,200-mile (8,300 km) range in a short period of time. With a blast yield of 100-200 kt of TNT each(which is 10 times more powerful than the atomic bombs used in Hiroshima and Nagasaki), they were capable of annihilating entire countries. 3)
Today only one Akula, TK-208 Dmitry Donskoy, remains in service. 4)