"Twenty Thousand" often refers to the novel "Twenty Thousand Leagues Under the Sea" by Jules Verne. Published in 1870, this science fiction story follows the adventures of Professor Aronnax, his servant Conseil, and Canadian whaler Ned Land as they journey aboard the submarine Nautilus, commanded by the enigmatic Captain Nemo. The title reflects the distance they travel underwater, which is approximately 20,000 leagues. The novel explores themes of exploration, technology, and the conflict between man and nature. It is considered one of the earliest works of science fiction and has inspired numerous adaptations in film, theater, and other media, solidifying its place in literary history.