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
Jules Verne "Voyages extraordinaires" series continued for several years afterwards at the same rate of two volumes a year. It was later discovered that Michel Verne had made extensive changes in these stories, and the original versions were eventually published at the end of the 20th century by the Jules Verne Society (Société Jules Verne). In 1919, Michel Verne published The Barsac Mission (), which original drafts contained references to Esperanto, language about which his father had great interest. In 1989, Verne's great-grandson discovered his ancestor's as yet unpublished novel "Paris in the Twentieth Century" which was subsequently published in 1994. Verne's