Nuclear submarine nuclear-powered submarine was first proposed in the United States Navy by the Naval Research Laboratory's Ross Gunn in 1939. Construction of the world's first nuclear powered submarine was made possible by the successful development of a nuclear propulsion plant by a group of scientists and engineers at the Naval Reactors Branch of the Bureau of Ships and the Atomic Energy Commission. In July 1951 the U.S. Congress authorized construction of the first nuclear-powered submarine, "Nautilus", under the leadership of Captain Hyman G. Rickover, USN (sharing names with Captain Nemo's fictional submarine in Jules Verne's "Twenty Thousand Leagues Under the Sea",
On the Beach (1959 film) months following World War III, the conflict has devastated the Northern Hemisphere, polluting the atmosphere with nuclear fallout, killing all life there. Air currents are slowly carrying the fallout south; the only areas still habitable are in the far reaches of the Southern Hemisphere. From Australia, survivors detect an incomprehensible Morse code signal coming from the West Coast of the United States. The American nuclear submarine, USS "Sawfish", now under Royal Australian Navy command, is ordered to sail north to the United States to attempt to make contact with the sender of the Morse signal. The submarine is commanded by