Behind a forbidden door is a terrifying secret!

The research, development, and deployment of the first atomic bomb, as well as the bombing of Hiroshima, are detailed in this docudrama.

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Main Cast: Brian Donlevy, Robert Walker, Tom Drake, Beverly Tyler, Hume Cronyn, Audrey Totter, Hurd Hatfield, Joseph Calleia, Godfrey Tearle, Victor Francen

Director: Norman Taurog

Writers: Frank Wead, Bob Considine

Editor: George Boemler

Cinematographer: Ray June

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