Twenty Thousand Leagues under the Sea is a classic science fiction novel written by Jules Verne in 1870.

The novel follows the adventures of a group of men aboard the submarine Nautilus, which is captained by the mysterious and enigmatic Captain Nemo.

The story begins when the Nautilus is spotted by a group of sailors who are subsequently taken captive by Captain Nemo and his crew.

The main character, Professor Pierre Aronnax, is a marine biologist who is fascinated by the undersea world and joins the Nautilus crew on their travels.

Over the course of the novel, Aronnax, and his companions explore the depths of the ocean and encounter a variety of creatures, including giant squids and sea monsters.

What's new will they get in their mission? Throughout the novel, Verne explores themes of exploration, adventure, and the power of technology.

The author also touches on the relationship between humans and the natural world, and the potential consequences of humanity's impact on the environment.