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

Top Cast

Lloyd BridgesDr. Doug Standish

Brian KellyDr. Craig Mosby

Shirley EatonDr. Margaret E. 'Maggie' Hanford

David McCallumDr. Philip Volker

Keenan WynnHank Stahl

Marshall ThompsonDr. Orin Hillyard

Gary MerrillDr. August 'Gus' Boren

Ron HayesBrinkman