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| Lloyd Bridges | Dr. Doug Standish | |
| Brian Kelly | Dr. Craig Mosby | |
| Shirley Eaton | Dr. Margaret E. 'Maggie' Hanford | |
| David McCallum | Dr. Philip Volker | |
| Keenan Wynn | Hank Stahl | |
| Marshall Thompson | Dr. Orin Hillyard | |
| Gary Merrill | Dr. August 'Gus' Boren | |
| Ron Hayes | Brinkman | |
| George Shibata | Prof. Uji Hamaru | |
| Donald Linton | Vice President | |
| Frank Logan | Captain of the Diligence | |
| Don Wells | Sonar Man on the Dilligence | |
| Jack Ewalt | Jack Smith / mining platform superintendant | |
| George De Vries | Coast Guard Lieutenant | |
| Tony Gulliver | Officer | |
| Joey Carter | Technician | |
| Celeste Yarnall | Secretary | |
| Paul Gray | Pilot |
| Director |
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| Producer | Andrew Marton
Ivan Tors Ben Chapman |
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| Writer | Art Arthur
Arthur Weiss E.M. Parsons |
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| Cinematography | Clifford H. Poland Jr.
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| Musician | Harry Sukman
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A five man submarine plants sensors around the worlds oceans to monitor for a impending earthquake. |
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