
Dr. Steven Sorenson plans to tap the geothermal energy of the Earth's interior by means of a thermonuclear device detonated deep within the Earth. This experiment causes a crack to form and grow within the Earth's crust, which threatens to split the earth in two if it is not stopped in time.
Cast

Dana Andrews
Dr. Stephen Sorenson

Janette Scott
Dr. Maggie Sorenson

Kieron Moore
Dr. Ted Rampion

Alexander Knox
Sir Charles Eggerston

Peter Damon
John Masefield
Sydna Scott
Angela

Gary Lasdun
Markov

John Karlsen
Dr. Reynolds

Alfred Brown
Dr. Bill Evans

Mike Steen
Steele

Todd Martin
Simpson
Jim Gillen
Rand
Ben Tatar
Indian Ambassador
Emilio Carrere
Unknown
Crew

Andrew Marton
Director
Jon Manchip White
Screenplay, Story
Julian Zimet
Screenplay
Derek Parsons
Editor
Manuel Berenguer
Director of Photography
José María Ochoa
Assistant Director

Philip Yordan
Executive Producer
Lester A. Sansom
Producer
Bernard Glasser
Producer
Laure Lourié
Costume Design
Josefa Rubio
Hairstylist
Carmen Martín
Makeup Artist
Kurt Herrnfeld
Sound Editor
Maurice Askew
Sound Recordist
David Hildyard
Sound Recordist
Alex Weldon
Special Effects

Eugène Lourié
Special Effects, Art Direction
Johnny Douglas
Original Music Composer, Conductor
Isabel Ruiz Capillas
Script Supervisor
Tíbor Reves
Production Manager
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