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.
You can now watch Terror Beneath the Sea online on the following streaming providers in the United States.
| Writing | Kôichi Ôtsu | Screenplay |
| Art | Shinichi Eno | Art Direction |
| Production | Ivan Reiner | Producer |
| Directing | Hajime Sato | Director |
| Production | Seiichi Yoshino | Producer |
| Camera | Kazuo Shimomura | Director of Photography |
| Editing | Fumio Soda | Editor |
| Writing | Masami Fukushima | Screenplay |
| Production | Masafumi Soga | Executive Producer |
| Crew | Nobuo Yajima | Special Effects |
| Production | Walter Manley | Producer |
| Sound | Shunsuke Kikuchi | Original Music Composer |
| Directing | Goro Hanawa | Assistant Director |
| Lighting | Toshiaki Morisawa | Lighting Technician |
| Sound | Hirokazu Iwata | Sound Recordist |