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.
Sonny Chiba
Peggy Neal
Franz Gruber
Andrew Hughes
Erik Neilson
Mike Daneen
Beverly Keller
Gunther Braun
Koji Miemachi
Tadashi Suganuma
Hideo Murota
Osamu Yamanouchi
Kosaku Okano
Ichiro Mizuki
Akemi Fuji
Enver Altenbay
Hans Horneff
Steve Queens