Nautilus (Verne) from seawater) is the craft's primary power source for propulsion and other services. "Nautilus" is double-hulled, and is further separated into water-tight compartments. Its top speed is . Its displacement is submerged. 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 whale, or perhaps a
Cultural influence of Jules Verne elaborate flying machines. Igor Sikorsky often quoted Verne and cited his "Robur the Conqueror" as the inspiration for his invention of the first successful helicopter. The rocketry innovators Konstantin Tsiolkovsky, Robert Goddard, and Hermann Oberth are all known to have taken their inspiration from Verne's "From the Earth to the Moon". Frank Borman, Jim Lovell, and William Anders, the astronauts on the Apollo 8 mission, were similarly inspired, with Borman commenting "In a very real sense, Jules Verne is one of the pioneers of the space age". When cosmonaut Georgi Grechko was orbiting Earth with Yuri Romanenko on the "Salyut