In Search of the Titanic

While searching for the Titanic, a team's submersible is attacked by sharks and sinks. They are rescued and taken to the magical city of Atlantis, where they get a potion to breathe underwater but are told they can never leave. When a gang of rebel rats plots to steal the Elixir of Life and conquer the world, the explorers must join forces with the King of Atlantis and his army of toys and mermen to stop the uprising and save their new home.