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
North Pole 1928, in the airship "Italia". The "Italia" crashed on its return from the Pole, with the loss of half the crew. In May 1937 the world's first North Pole ice station, North Pole-1, was established by Soviet scientists by air 20 kilometres (13 mi) from the North Pole. The expedition members: oceanographer Pyotr Shirshov, meteorologist Yevgeny Fyodorov, radio operator Ernst Krenkel, and the leader Ivan Papanin conducted scientific research at the station for the next nine months. By 19 February 1938, when the group was picked up by the ice breakers "Taimyr" and "Murman", their station had drifted 2850 km