Rent The Bermuda Depths (1978)

What secret lurks 20,000 feet below the waves in the paranormal realm called The Bermuda Triangle? That's the question a scientist (Burl Ives), his student (Carl Weathers) and a young man (Leigh McCloskey) haunted by nightmarish memories of his Bermuda childhood ask themselves. The answer involves a beauty (Connie Sellecca) who has sold her soul for eternal youth. And a giant sea turtle that leaves death in its wake. Eerie and hypnotic, 'The Bermuda Depths' was produced by Arthur Rankin, Jr and Jules Bass (The Year Without a Santa Claus), who meld their imaginative fantasy style with the live-action horror genre.