Swiftsure-class submarine
The Swiftsure class was a class of nuclear-powered fleet submarines in service with the Royal Navy from the early 1970s until 2010.
HMS Spartan in 1993
A nuclear submarine is a submarine powered by a nuclear reactor, but not necessarily nuclear-armed. Nuclear submarines have considerable performance advantages over "conventional" submarines. Nuclear propulsion, being completely independent of air, frees the submarine from the need to surface frequently, as is necessary for conventional submarines. The large amount of power generated by a nuclear reactor allows nuclear submarines to operate at high speed for long periods, and the long interval between refuelings grants a range virtually unlimited, making the only limits on voyage times being imposed by such factors as the need to restock food or other consumables.
British Astute-class submarine
USS Nautilus, the first nuclear-powered submarine.
The smallest nuclear-powered submarine, the U.S. Navy's NR-1.
The nuclear-powered VMF Typhoon-class submarines were the world's largest-displacement submarines.