You are going to Watch Nadia: The Secret of Blue Water Episode 18 English dubbed online free episodes with HQ / high quality. Stream Anime Nadia: The Secret of Blue Water Episode 18 Online English dub Nautilus vs. Nautilus. To repair the damage caused by the last attack from Gargoyle, Captain Nemo orders the Nautilus to set sail for Antarctica. The passengers are mortified by the thought, especially Sanson, who goes into an exaggerated tirade on what an unstably icy place Antarctica really is. Jean, however, is quite excited by the idea of traveling to a new place. When the submarine arrives at Antarctica, an ancient “shellfish” squid latches onto the Nautilus and threatens to destroy it. The Nautilus attempts to get rid of it by ramming into an iceberg, to no avail. They finally succeed in losing their menace by steering toward an explosive underwater volcano. Unable to endure the excruciating heat, the shellfish lets go and drifts away. The Nautilus then travels through a tunnel to its subterranean base.