Initially, the central problem of Twenty Thousand Leagues under the Sea by Jules Verne appears to be a mysterious creature that is sinking ships. The United States government hires Professor Pierre Aronnax, the first person narrator of the novel, and his servant Conseil, as well as a Canadian harpooner Ned Land to destroy the monster. They board the United States naval frigate Abraham Lincoln and eventual encounter the monster, which turns out to be a submarine commanded by Nemo. Their next major problem because how to escape the submarine and survive, although the previous problem, that Nemo continues to destroy ships with the submarine, still remains. They escape in the maelestrom and the submarine may have been destroyed there.