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
Valley of the Dragons (1961 film) to try and get on the earth the next time the comet approaches. The film was produced by Al Zimbalist who says he was given a copy of the Verne novel that his 16 year old son Don had found in a London bookshop. Director Edward Bernds says the novel had not been published in the US due to its anti semitism. Jules Verne adaptations were in vogue at the time ever since the success of "Twenty Thousand Leagues Under the Sea" and "Around the World in 80 Days". Zimbalist had the rights to footage for "One Million B.C." (1940).