Directed by Virgil W. Vogel | Starring: Jock Mahoney, Shirley Patterson, William Reynolds, Henry Brandon

Navy Commander Alan Roberts is assigned to lead an expedition to Little America in Antarctica to investigate reports of a mysterious warm water inland lake discovered a decade earlier. His helicopter and its small party, including reporter Maggie Hathaway, is forced down into a volcanic crater by a fierce storm. They find themselves trapped in a lush tropical environment that has survived from prehistoric times.

IMDb The Land Unknown movie posters