Splash (1984)

Eugene Levy, Daryl Hannah, Clint Howard, John Candy

Allen Bauer is rescued from drowning as a young boy off Cape Cod by a young mermaid. Years later, he returns to the same location, and once again manages to fall into the sea, and is rescued once more by the mermaid (Allen isn't sure what he has seen and what he has imagined). Using maps from a sunk