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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Sonny Chiba
Ken Abe
Peggy Neal
Jenny Gleason
Franz Gruber
Commander Brown
Andrew Hughes
Erik Neilson
Dr. Moore
Mike Daneen
Dr. Josef Heim
Beverly Keller
Gunther Braun
Submarine captain
Koji Miemachi
Tadashi Suganuma
Nishida
Hideo Murota
Henchman
Osamu Yamanouchi
Kosaku Okano
Nakamura
Ichiro Mizuki
Akemi Fuji
Female researcher
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