Nobita's Monstrous Underwater Castle

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Nobita's Monstrous Underwater Castle was one of the first Doraemon movies, released March 12, 1983. The movie was based on the Western myth of Atlantis, the lost city.

The plot of the movie revolves around a summer vacation of Nobita and his friends under the waters of Pacific Ocean. Jaian and Suneo's take Doraemon's underwater vehicle and travel through the Atlantic Ocean, trying to find a treasure ship. Along the way, they discover that the environment gun that Doraemon used to protect them is running out of energy leaving them vulnerable to the sea; fortunately they are rescued by some marine creatures. Doraemon and his friends are later captured by these creatures revealed to be inhabinats of the underwater kingdom of Mu. It is revealed that another under sea kingdom Atlantis, now controlled by robots was about to destroy the Earth with nuclear weapons after mistaking a volcano eruption for an invasion. With the help of a young boy from Mu, Nobiata and his friends attempt to stop the robots, but are all captured. However, when things are at their grimmest, Doraemon's robotic underwater vehicle sacrifices itself to destroy the computer that controlled all the robots and nuclear weapons. After returning to Mu, Doraemon, and his friends are hailed as heroes.