20,000 Leagues Under the Sea by Jules Verne. Twenty Thousand Leagues Under the Sea is a classic science fiction novel by French writer Jules Verne published in 1870. It tells the story of Captain Nemo and his submarine Nautilus, as seen from the perspective of Professor Pierre Aronnax after he, his servant Conseil, and Canadian whaler Ned Land wash up on their ship. On the Nautilus, the three embark on a journey which has them going all around the world, under the sea.