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.

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Main Cast: Sonny Chiba, Peggy Neal, Franz Gruber, Andrew Hughes, Erik Neilson, Mike Daneen, Beverly Keller, Gunther Braun, Koji Miemachi, Tadashi Suganuma

Director: Hajime Sato

Writers: Kôichi Ôtsu, Masami Fukushima

Editor: Fumio Soda

Cinematographer: Kazuo Shimomura

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