Alligator was a submarine designed by the French that was deployed during the American Civil War by the Union. It was 47 ft long and had 4 ft in diameter. ¹⁾.

With a submerged displacement of 48.000 tonnes, length of 574ft (175m), and beam of 75ft (23m), Project-941 Akula class (NATO reporting name Typhoon) nuclear-powered submarines are biggest ever made²⁾. They could reach 27 knots (50km/h) submerged and stay over 120 days under the water. They could carry 20 R-39 ballistic missiles³⁾, each with 10 nuclear warheads. This means that each of six Typhoon-class submarine was able to sneak to almost any place in the world undetected, and launch in short period of time nuclear warheads to 200 separate targets in 5.200 miles (8,300 km) range. With blast yield of 100-200 kt TNT each⁴⁾, even ten times more powerful than atomic bombs used in Hiroshima and Nagasaki, they were able to annihilate the whole countries.