Have you got the answer to Hydronaut's question?

A forgotten aquatic based sci-fier from an era that loved them, Andrew Marton's film isn't extremely bad exactly, it's just that it plods along without ever really reaching exciting heights.

Cast features Lloyd Bridges, Brian Kelly, Shirley Eaton, David McCallum and Keenan Wynn, who are tasked with traversing the world's ocean beds to plant sensors that will warn mankind of impending earthquakes. A tricky task for sure, especially after we have been told at the start that the depths of the ocean is more inhospitable than anything in space.... read the rest.