John Bromfield is the busted skipper of the ship, with Lon Chaney Jr. His dull but amiable crew. . He finds a map to a pirate treasure, but can't make heads nor tails of it. Beachcomber Victor Jory can, and offers to split. But neither he nor Bromfield figure on splitting with a partner, and dead men tell no tales.
It's another B movie directed by W. Lee Wilder, whom brother Billy called "A dull son of a b***h. Fortunately he has a good underwater cameraman in Scotty Welbourne, who shoots Jamaica footage well, and his wife, Tessa Prendergast, even better. Jory acts up a storm, and that keeps the second half of this movie going.