Twenty Thousand Leagues Under the Sea even for 1869 ... In none of these technical situation did Verne take advantage of knowledge readily available to him at the time". Thomas said, however, that despite poor science, plot, and characterization, "Put them all together with the magic of Verne's story-telling ability, and something flames up. A story emerges that sweeps incredulity before it". Jules Verne's wrote a sequel to this book: "L'Île mystérieuse" ("The Mysterious Island", 1874), which concludes the stories begun by "Twenty Thousand Leagues Under the Sea" and "In Search of the Castaways". While "The Mysterious Island" seems to give more information about Nemo (or
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