"Twenty Thousand Leagues Under the Sea" is a science fiction novel written by Jules Verne, published in 1870. The story follows Professor Aronnax, his servant Conseil, and a Canadian whaler named Ned Land as they embark on a journey to capture a mysterious sea creature. Instead, they encounter the submarine Nautilus, commanded by the enigmatic Captain Nemo. As they travel through the oceans, the characters experience various underwater adventures and explore marine life. The novel delves into themes of exploration, technology, and the conflict between humanity and nature, showcasing Verne's imaginative vision of the future of underwater travel.