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 its combination of adventurous narrative, travel themes, and detailed historical research, would later be described by Verne as "the first indication of the line of novel that I was destined to follow." Dumas fils put Verne in contact with Jules Seveste, a stage director who had taken over the directorship of the Théâtre-Historique and renamed it the Théâtre Lyrique. Seveste offered Verne the job of secretary of the theatre, with little or no salary attached. Verne accepted, using the opportunity to write and produce several comic operas written in collaboration with Hignard and the prolific librettist Michel Carré. To celebrate