Phyllis Coates accepted the role of Dale Marshall as a favor to director Jerry Warren, who was a former boyfriend; the actress originally cast in the lead couldn't do it and Warren couldn't find anyone else in time. He convinced Coates to do it by telling her that the film would not be shown in California. However, after it was completed, she found out that Warren did indeed release the film in California, and she was told by at least one studio executive (at Columbia) that the film was so inferior and shoddy that the studio would not be hiring her again. On top of that, Warren never paid her.
In an interview, star Robert Clarke said that the film's cinematographer is actually a well-known Hollywood cameraman who used the pseudonym "Victor Fisher" so he wouldn't get in trouble with the union for taking a job on this non-union picture.
The opening shots of the film contain a copyright from 1957, but the film was never actually registered for an official copyright.
Completed by at least March 1957, not released until 1959.
The film remained unreleased for several years until it was put on the bottom of a packaged double feature with another Jerry Warren film, Teenage Zombies (1959).
Brianne Murphy who worked as the dialogue director for the film was married at the time to director Jerry Warren. The two co-owned G.B.M. productions, the company that produced this film.
The underwater caves scenes were filmed at Colossal Cave in Tucson, Arizona.
