- Country: UK
- Genres: Drama, Sci-Fi
- Release: 1963-02-16
- Director: N/A
- Writers: N/A
- Language: N/A
- Stars: Gerald Flood , Stewart Guidotti , Peter Williams , Richard Coleman , Ingrid Sylvester , Delena Kidd , David Spenser , Robert James , Derek Smee , Michael Darlow
- Runtime: 30 min
- Awards: N/A
- AKA: Secret Beneath the Sea (United Kingdom) , Secret Beneath the Sea
- Plot: A sequel to City Beneath the Sea. A journalist goes to the ocean floor to look for Phenicium, a rare metal vital for space research. Of course, the bad guys want it, too.
- IMDB:tt0210447
Secret Beneath the Sea Cast
Gerald Flood
Mark Bannerman
Stewart Guidotti
Peter Blake
Peter Williams
Captain Payne
Richard Coleman
Dr. Deraad
Ingrid Sylvester
Janet Slayton
Delena Kidd
Dr. Ellen Carey
David Spenser
Professor Soobiah
Robert James
Professor Gordon
Derek Smee
Engineer
Michael Darlow
Helmsman