as Steve Karnes

as Prof. James Bickford

as Jean Trevethan

as John

as Dr. C. A. Morris, the village doctor

as Senior Admiral, at the Admiralty

as Dr. Sampson, the paleontologist

as Mini Submarine Officer

as Tom Trevethan

as Photo Lab Aide

as Naval Commader, at the "Valkyrie" wreck (uncredited)

as Dialogue Scientist at Conference (bit)

as Scientist at Conference (uncredited)

as TV Newscaster (uncredited)

as Man Listening to Car Radio (uncredited)

as PLA Radio Operator (uncredited)

as Dr. Sampson's Helicopter Pilot (uncredited)

as French Radio Officer (uncredited)

as The Radar Operator, at the radar room (uncredited)

as Naval Officer in Situation Room (uncredited)