Amphibian Man tells the story of Ichthyander, a young man surgically modified by a scientist (Dr. Salvator) to live both on land and underwater by implanting shark gills. Raised in isolation, Ichthyander becomes known as the mysterious "Sea Devil" when locals spot him in the ocean. It's one of the most famous early Soviet sci-fi works and has been adapted into films, most notably the 1962 Soviet movie