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
Road to the North Pole North Pole" is the sixth episode of the "Road to" episodes of the series which air through various seasons of the show. It was directed by "Family Guy" veteran Greg Colton, this being the first episode he has directed since the eighth season episode "Go Stewie, Go." This is also Colton's third "Road to" episode, the first being "Road to Germany" and the second being "Road to the Multiverse." The episode was written by Chris Sheridan and Danny Smith, this being the first Smith wrote since "Partial Terms of Endearment," and his first "Road to" episode. It included staff writers