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The film opens with the following voice-over narration: "Those who lived to tell the tale remember that the day began with fragile, breathtaking beauty. The temperature was cool, air mountain pure...A day unreal enough to serve as the setting for the birth of the world or the death of it." According to a June 1956 Hollywood Reporter news item, Lou Morheim was originally signed to write the script and Bob Kent to produce. Although a November 1956 Hollywood Reporter news item adds Luana Lee to the cast, her appearance in the released film has not been confirmed. A November 1956 Los Angeles Times news item notes that location filming was done at the Carlsbad Caverns, NM. A November 1956 Hollywood Reporter news item adds that filming also was done at the Iverson Ranch in Chatsworth, CA and at the Datatron Corporation building in Pasadena, CA.