Born in the French river town of Nantes, Verne had a lifelong passion for the sea. First as a Paris stockbroker, later as a celebrated author and yachtsman, he went on frequent voyages—to Britain, America, the Mediterranean. But the specific stimulus for this novel was an 1865 fan letter from a fellow writer, Madame George Sand. She praised Verne’s two early novels Five Weeks in a Balloon (1863) and Journey to the Center of the Earth (1864), then added: “Soon I hope you’ll take us into the ocean depths, your characters traveling in diving equipment perfected by your science and your imagination.” Thus inspired, Verne created one of literature’s great rebels, a freedom fighter who plunged beneath the waves to wage a unique form of guerilla warfare. Initially, Verne’s narrative was influenced by the 1863 uprising of Poland against Tsarist Russia. The Poles were quashed with a violence that appalled not only Verne but all Europe. As originally conceived, Verne’s Captain Nemo was a Polish nobleman whose entire family had been slaughtered by Russian troops. Nemo builds a fabulous futuristic submarine, the Nautilus, then conducts an underwater campaign of vengeance against his imperialist oppressor. But in the 1860s France had to treat the Tsar as an ally, and Verne’s publisher Pierre Hetzel pronounced the book unprintable. Verne reworked its political content, devising new nationalities for Nemo and his great enemy—information revealed only in a later novel, The Mysterious Island (1875); in the present work Nemo’s background remains a dark secret. In all, the novel had a difficult gestation. Verne and Hetzel were in constant conflict and the book went through multiple drafts, struggles reflected in its several working titles over the period 1865-69: early on, it was variously called Voyage Under the Waters, Twenty-five Thousand Leagues Under the Waters, Twenty Thousand Leagues Under the Waters, and A Thousand Leagues Under the Oceans. Verne is often dubbed, in Isaac Asimov’s phrase, “the world’s first science-fiction writer.” And it’s true, many of his sixty-odd books do anticipate future events and technologies: From the Earth to the Moon (1865) and Hector Servadac (1877) deal in space travel, while Journey to the Center of the Earth features travel to the earth’s core. But with Verne the operative word is “travel,” and some of his best-known titles don’t really qualify as sci-fi: Around the World in Eighty Days (1872) and Michael Strogoff (1876) are closer to “travelogs”—adventure yarns in far-away places.