Nautilus (Verne) assembled by Nemo's men on a desert island. "Nautilus" most likely returned to this island and later helped castaways in the novel "The Mysterious Island". After Nemo dies on board, the volcanic island erupts, entombing the Captain and "Nautilus" for eternity. Beside her original appearance in "Twenty Thousand Leagues Under the Sea" and "The Mysterious Island", "Nautilus" and Captain Nemo have appeared in numerous other works. Submarines feature in some other of Verne's works. In the 1896 novel "Facing the Flag", the pirate Ker Karraje uses an unnamed submarine that acts both as a tug to his schooner "Ebba" and
Jules Verne Denmark to return in haste to Paris, but missed the birth on 3 August 1861 of his only biological son, Michel. Meanwhile, Verne continued work on the idea of a "Roman de la Science", which he developed in a rough draft inspired, according to his recollections, by his "love for maps and the great explorers of the world". It took shape as a story of travel across Africa and would eventually become his first published novel, "Five Weeks in a Balloon". In 1862, through their mutual acquaintance Alfred de Bréhat, Verne came into contact with the publisher Pierre-Jules Hetzel, and