Around the World Under the Sea (1966) on Netflix

Plot summary

An American-led group of experts from several countries takes a nuclear-powered research submarine, the Hydronaut, on a submerged voyage around the world. The task is to place monitoring devices on the ocean floor so that researchers can predict earthquakes before they strike. The voyage follows tidal waves that have destroyed much of coastal Turkey and done damage elsewhere. Among those aboard are Dr. Doug Standish, Dr. Craig Mosby, Dr. Margaret E. 'Maggie' Hanford and Dr. Philip Volker. The route brings exploding underwater volcanoes and giant eels, and the crew is often at odds, particularly over one man's wish to steer the submarine to a shipwreck whose safe is said to hold diamonds and pearls.