"20,000 Leagues Under the Sea" is a classic science fiction adventure novel written by the French author Jules Verne. First published in 1870, the novel is set in the 19th century and follows the thrilling journey of Captain Nemo and his remarkable submarine, the Nautilus.The story is narrated by Professor Pierre Aronnax, a renowned marine biologist who, along with his loyal servant Conseil and harpoonist Ned Land, is taken aboard the Nautilus after their ship is attacked and sunk by an enigmatic and reclusive captain known as Captain Nemo. Nemo is a mysterious and enigmatic character who shuns contact with the outside world and chooses to live beneath the sea, exploring its depths in his advanced and technologically advanced submarine.As the protagonists join Nemo on his undersea adventures, they discover a breathtaking and fantastical world beneath the waves. They encounter a wide variety of marine life, explore hidden underwater landscapes, and even witness the lost city of Atlantis. The novel explores themes of exploration, the wonders of the natural world, and the consequences of unchecked technology."20,000 Leagues Under the Sea" is not only an exciting adventure story but also a reflection on the relationship between humanity and nature, as well as the ethical dilemmas posed by scientific and technological progress. Jules Verne's vivid descriptions of the undersea world and the captivating character of Captain Nemo have made this novel a timeless classic in the genre of science fiction and adventure literature. It continues to captivate readers with its sense of wonder and imagination, as well as its exploration of the mysteries of the deep sea.