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Unknown World

Unknown World(1951)

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The working titles for this film were Night Without Stars and To the Center of the Earth. The film closes with the following written epilogue: "Portions of this film were photographed at Carlsbad Caverns National Park, Carlsbad, New Mexico, with the courtesy and cooperation of the National Park Service, United States Department of the Interior." A December 29, 1950 Hollywood Reporter article states that producers I. A. Block and J. R. Rabin, owners of a matte service at the time, edited the film, then titled Night Without Stars, on the Eagle-Lion Studios lot. According to a August 3, 1951 Hollywood Reporter article, Block and Rabin originally co-produced the film with Philip Yordan; however, Yordan's participation in the film has not been confirmed.