Gunther Braun

Kaitei daisensô

Hajime Sato

Shin'ichi Chiba, Peggy Neal

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.