The Land Unknown (1957) (DualDisc, Blu-ray + DVD)

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When the United States Navy receives reports that a strange area of warm water exists in the otherwise frozen Antarctica they dispatch a team to investigate the phenomenon.

Soon after the expedition begins, Commander Harold Roberts, reporter Margaret Hathaway and their companions are caught in a storm which brings down their helicopter. After surviving the crash they emerge to find themselves in a spectacular hidden valley home to beasts thought extinct for millennia.