Kaitei daisensô

Here is a 2-4 sentence description of the movie "Kaitei Daisensô" (1966): Reporter Ken Abe (Sonny Chiba) and photographer Jenny Gleason are captured by a group of fish-men while investigating a mysterious swimming creature during a US Navy torpedo test. The fish-men, known as "water cyborgs," are being created by Professor Moore (Andrew Hughes) to serve as his soldiers in a plan to unify the world. The pair must escape the underwater base before they are transformed into cyborgs, and they are eventually rescued by a US Navy submarine. After their ordeal, Jenny is restored to her normal appearance and reunites with Ken, bringing him a story to tell.