In 1889, humanity stands at the height of technological progress. Amid this era, a menacing figure called Gargoyle, obsessed with resurrecting the former Atlantean empire, initiates a scheme to dominate the world. Nadia, aided by the young inventor Jean Raltique and the enigmatic Captain Nemo aboard the submarine Nautilus, must confront Gargoyle and the Neo‑Atlantis threat to protect the world. The series is inspired by Jules Verne’s novel *20,000 Leagues Under the Sea*.