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 ATV final docking procedure was guided by the videometer, which fired laser pulses at cube-shaped reflectors on the "Zvezda" module, and the telegoniometer, which functioned like a radar system. The ISS crew could have aborted the docking at any point up until the ATV was one metre from the station (this was known as the CHOP or Crew Hands-Off Point); however, this did not prove necessary. "Jules Verne" successfully docked with the ISS on 3 April 2008 at 14:45 UTC. During Demo-Day 1, the ATV's first rendezvous with the ISS was conducted. The manoeuvre culminated in a successful rendezvous with the