cast
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Ben Gazzara
Cmdr. Adrian Blake
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Walter Pidgeon
Dr. Samuel Andrews
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Ernest Borgnine
Chief Diver Don MacKay
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Yvette Mimieux
Dr. Leah Jansen
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Donnelly Rhodes
Diver Bob Cousins
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Chris Wiggins
Capt. Williams
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Michael J. Reynolds
Dr. Hal Hamilton
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Mark Walker
Diver Dave Moulton
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Leslie Carlson
Brigs, Triton Radioman
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Stuart Gillard
Diver Phil Bradley
- Ed McGibbon Dr. Norton Shepherd
- David Renton Warrant Officer
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Joan Gregson
Dobson
- David Yorston Diver Stephens
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Ken Pogue
Diver Thomas
- Dave Mann Hawkes
- Frank Perry Sub Captain
- Kei Fujiwara Kay, lab technician
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Dan MacDonald
Lt. Hobbs, Halifax day officer
- Richard Whelan Radio Officer