No, 20,000 Leagues Under the Sea is not a true story. It is a science fiction novel written by Jules Verne, first published in 1870. The book tells the story of Captain Nemo and his submarine, the Nautilus, as they explore the depths of the ocean. While the novel is filled with detailed descriptions of marine life and underwater landscapes, it is entirely a work of fiction.
Jules Verne was known for his imaginative storytelling and his ability to blend scientific knowledge with adventure. Although the technology described in the book, such as the submarine, was ahead of its time, it was not based on real events or actual scientific achievements of the period.
In summary, 20,000 Leagues Under the Sea is a captivating tale of adventure and exploration, but it is not a true story.