Hold your breath for the biggest undersea adventure of all!

A five man submarine plants sensors around the worlds oceans to monitor for a impending earthquake.

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Main Cast: Lloyd Bridges, Brian Kelly, Shirley Eaton, David McCallum, Keenan Wynn, Marshall Thompson, Gary Merrill, Ron Hayes, George Shibata, Donald Linton

Director: Andrew Marton

Writers: Arthur Weiss, Art Arthur

Editor: Warren Adams

Cinematographer: Clifford H. Poland Jr.

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