cast
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Gene Evans
Steve Karnes
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André Morell
Prof. James Bickford
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Leigh Madison
Jean Trevethan
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John Turner
John
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Alastair Hunter
Dr. C. A. Morris, the village doctor
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Lloyd Lamble
Senior Admiral, at the Admiralty
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Jack MacGowran
Dr. Sampson, the paleontologist
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Maurice Kaufmann
Mini Submarine Officer
- Henri Vidon Tom Trevethan
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Patrick Jordan
Photo Lab Aide
- Howard Lang Naval Commader, at the "Valkyrie" wreck (uncredited)
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Leonard Sachs
Dialogue Scientist at Conference (bit)
- Ernest Blyth Scientist at Conference (uncredited)
- Neal Arden TV Newscaster (uncredited)
- Paul Beradi Man Listening to Car Radio (uncredited)
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Max Faulkner
PLA Radio Operator (uncredited)
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Neil Hallett
Dr. Sampson's Helicopter Pilot (uncredited)
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André Maranne
French Radio Officer (uncredited)
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Derren Nesbitt
The Radar Operator, at the radar room (uncredited)
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Guy Standeven
Naval Officer in Situation Room (uncredited)