Latitude Zero

A journalist is saved by a giant submarine captained by a 200-year-old man who takes him to an underwater paradise city where no one ages. That's when monsters and mutants sent by the captain's rival, a 200-year-old scientist, attack.

Latitude Zero is a 1969 adventure sci-fi movie directed by Ishirô Honda, starring Joseph Cotten, Richard Jaeckel, Cesar Romero. It holds an IMDb rating of 5.9/10 from 1,179 votes and runs 1h 29m.