- HD 1080
- Runtime: 84m.
- Status: Released
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- Languages: ja
- Country: Japan, United States of America
- Director: Hajime Sato
- Stars: Sonny Chiba, Peggy Neal, Franz Gruber, Andrew Hughes, Erik Neilson
- Production_studio: Ram Films Inc., K. Fujita Associates Inc., Toei Company
- providers: fuboTV, AMC Plus Apple TV Channel, AMC+ Amazon Channel, AMC+ Roku Premium Channel, AMC+, AMC
- The Terror Beneath the Sea is featured in the top rankings of 1966
- #28 in Top Horror Movies of 1966
While covering a test of guided torpedoes, two reporters believe they see what appears to be a strange-looking swimming creature. They investigate the matter further and discover that there is a race of fish-men living under the sea. The fish-men capture the pair and keep them prisoner in their underwater city.