Nautilus

Nautilus is the fictional submarine belonging to Captain Nemo featured in Jules Verne's novels Twenty Thousand Leagues Under the Seas (1870) and The Mysterious Island (1874). Verne named the Nautilus after Robert Fulton's real-life submarine Nautilus (1800). For the design of the Nautilus, Verne was inspired by the French Navy submarine Plongeur, a model of which he had seen at the 1867 Exposition Universelle, three years before writing his novel. Description Nautilus is described by Verne as "a masterpiece containing masterpieces". It is designed and commanded by Captain Nemo. Electricity provided by sodium/mercury batteries (with the sodium provided by extraction from seawater) is the craft's primary power source for propulsion and other services. The energy needed to extract the sodium is provided by coal mined from the sea floor. Nautilus is double-hulled, and is further separated into water-tight compartments. Its top speed is . In Captain Nemo's own words: Nautilus uses floodable tanks in order to adjust buoyancy and so control its depth. The pumps that evacuate these tanks of water are so powerful that they produce large jets of water when the vessel emerges rapidly from the surface of the water. This leads many early observers of Nautilus to believe that the vessel is some species of marine mammal, or perhaps a sea monster not yet known to science. To submerge deeply in a short time, Nautilus uses a technique called "hydroplaning", in which the vessel dives down at a steep angle.