Doraemon: Nobita's Undersea Castle

As summer vacation approaches, the group argues over where to go camping. Nobita and Shizuka want to go to the beach, while Gian and Suneo prefer hiking in the mountains. Ultimately, at Doraemon's suggestion, they decide to go to an underwater mountain. During their undersea camping trip, Nobita and his friends encounter sea people. Due to volcanic activity on the ocean floor, they learn that Atlantis is preparing to become active again. If Atlantis launches its Ghost Horn Bomb, it will destroy the entire world. To prevent this catastrophe, Nobita and his friends set out for the Bermuda Triangle area of Atlantis to stop the conspiracy.