Twenty Thousand Leagues Under the Sea Twenty Thousand Leagues Under the Sea Twenty Thousand Leagues Under the Seas: A Tour of the Underwater World (, "Twenty Thousand Leagues Under the "Seas": A Tour of the Underwater World") is a classic science fiction adventure novel by French writer Jules Verne published in 1870. The novel was originally serialized from March 1869 through June 1870 in Pierre-Jules Hetzel's periodical, the . The deluxe illustrated edition, published by Hetzel in November 1871, included 111 illustrations by Alphonse de Neuville and Édouard Riou. The book was highly acclaimed when it was released and still is; it is regarded as one
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