History of submarines few years before the US, and paralleled subsequent US development in this area. In the 1950s, nuclear power partially replaced diesel-electric propulsion. The sailing of the first nuclear-powered submarine, the USN ""Nautilus"" in 1955 was soon followed by similar British, French and Russian boats. Equipment was also developed to extract oxygen from sea water. These two innovations, together with inertial navigation systems, gave submarines the ability to remain submerged for weeks or months, and enabled previously impossible voyages such as the crossing of the North Pole beneath the Arctic ice cap by the USS "Nautilus" in 1958. Most of the
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