Twenty Thousand Leagues Under the Sea as an inhabitant of British Colonial India, "is an inhabitant of an oppressed country". Verne took the name "Nautilus" from one of the earliest successful submarines, built in 1800 by Robert Fulton, who later invented the first commercially successful steamboat. Fulton's submarine was named after the paper nautilus because it had a sail. Three years before writing his novel, Jules Verne also studied a model of the newly developed French Navy submarine "Plongeur" at the 1867 Exposition Universelle, which inspired him for his definition of the "Nautilus". The breathing apparatus used by "Nautilus" divers is depicted as an untethered version
Sphere (novel) original code, Johnson realizes by transposition the entity's name should be "Harry" (Adams). Johnson hypothesizes that the sphere is an object which allows a person's subconscious thoughts to manifest in reality, and Harry Adams has acquired the power through entering it. (Confirmed by his childhood fear of squid, especially the giant squid in the novel "Twenty Thousand Leagues Under the Sea", manifested in the form of a vast number of small squid and later a giant squid that attacks the DH-8 Habitat.) Johnson and Halpern sedate Adams and wait for contact to be re-established with the surface, but the manifestations