Latitude Zero 0 , Ido zero daisakusen? , is a 1969 tokusatsu film. It was directed by Ishir Honda with special effects by Eiji Tsuburaya his last sciencefiction film. The story was written by Ted Sherdeman, writer of the 1954 sciencefiction film Them and based on a 1941 radio serial written by Sherdeman entitled Latitude Zero, and starred Joseph Cotten, Cesar Romero, Akira Takarada, Masumi Okada, Richard Jaeckel, Patricia Medina, and Akihiko Hirata.
Three men Dr. Ken Tashiro, Dr. Jules Masson, and Perry Lawton are trapped in a bathysphere due to seismic activity. They are rescued by the crew of the supersubmarine Alpha, captained by Craig Mackenzie Cotten, who they learn is over 200 years old and that the Alpha was launched in the early 19th century. Mackenzie takes them to Latitude Zero to deal with the serious injuries of Dr Masson. While returning to Latitude Zero, they are attacked by a rival supersubmarine, the Black Shark, captained by Kuroi, who works for a rival of Mackenzie, Malic, who is also over 200 years old and has a base at Blood Rock.Latitude Zero is a paradise hidden fifteen miles below the surface at the intersection of the Equator and the International Date Line. Gold is plentiful there and is used for protective clothing by the islands newcomers, while those who arrived in the 19th century prefer to dress as they are accustomed, as no one ages or dies. Diamonds are very common and used only in industrial use. ........
Source: Wikipedia