Woman Diver's Terror 1957 海女の戦慄

Chie, who's chosen as 'Ms. Woman Diver', and her friend Yuki, have been missing for several days after they left for Tokyo to be interviewed by a magazine. Later, Yuki is found dead in the sea. Yoshi, Chie's sister, along with sailor Shunsuke, try to find Chie. Soon they learn about a conspiracy with diamonds in a ship sunk in the sea.