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
Jules Verne rather than a serious author worthy of academic study. This denial of formal literary status took various forms, including dismissive criticism by such writers as Émile Zola and the lack of nomination to Verne for membership in the Académie Française, and was recognized by Verne himself, who said in a late interview: "The great regret of my life is that I have never taken any place in French literature." To Verne, who considered himself "a man of letters and an artist, living in the pursuit of the ideal", this critical dismissal on the basis of literary ideology could only be