Atlantis: The Lost Empire from Studio Ghibli, particularly in its character design, setting, and story. Although Disney never responded formally to claims of plagiarism, co-director Kirk Wise posted on a Disney animation newsgroup in May 2001, "Never heard of "Nadia" till it was mentioned in this [newsgroup]. Long after we'd finished production, I might add." Both "Atlantis" and "Nadia" were inspired, in part, by the 1870 Jules Verne novel "Twenty Thousand Leagues Under the Sea", of which Lee Zion (reporting for Anime News Network) wrote, "There are too many similarities "not" connected with "20,000 Leagues" for the whole thing to be coincidence." Critics also
Twenty Thousand Leagues Under the Sea of underwater breathing apparatus designed by Benoit Rouquayrol and Auguste Denayrouze in 1865. They designed a diving set with a backpack spherical air tank that supplied air through the first known demand regulator. The diver still walked on the seabed and did not swim. This set was called an "aérophore" (Greek for "air-carrier"). Air pressure tanks made with the technology of the time could only hold 30 atmospheres, and the diver had to be surface supplied; the tank was for bailout. The durations of 6 to 8 hours on a tankful without external supply recorded for the Rouquayrol set in