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Gene Evans
Steve Karnes
André Morell
Prof. James Bickford
Leigh Madison
Jean Trevethan
John Turner
John
Alastair Hunter
Dr. C. A. Morris, the village doctor
Lloyd Lamble
Senior Admiral, at the Admiralty
Jack MacGowran
Dr. Sampson, the paleontologist
Maurice Kaufmann
Mini Submarine Officer
Henri Vidon
Tom Trevethan
Patrick Jordan
Photo Lab Aide
Howard Lang
Naval Commader, at the "Valkyrie" wreck (uncredited)
Leonard Sachs
Dialogue Scientist at Conference (bit)