An unusual science fiction adventure set not in the future, but in the past. It is 1903 and just off the Cornish coast lives an undersea kingdom of humanlike creatures who never age. The ruler of this strange society sees a woman on land who looks like the reincarnation of the ruler's deceased wife. This sets off a chain of events that eventually bring the human world into battle against this underwater community of the past. Memorable for its creative sets and creepy gill man warriors, this drive-in classic is based on a line from an Edgar Allen Poe work and is sprinkled with references to Poe throughout. Tab Hunter, wearing gigantic scuba gear similar to a robot costume, and Vincent Price star.