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 Housewives" on ABC, "The Amazing Race" and "Undercover Boss" on CBS and "Sunday Night Football" on NBC. The episode also acquired a 3.9 rating in the 18–49 demographic, beating "American Dad!" and "The Simpsons" in addition to significantly edging out both shows in total viewership. The episode's ratings increased significantly from the previous week's episode. This episode received generally positive response from critics. Todd VanDerWerff of "The A.V. Club" gave "Road to the North Pole" a positive review, stating that it is "a satisfying episode of "Family Guy" all around, filled with funny gags and nice moments." He especially praised