The Land Unknown

Directed by Virgil W. Vogel

With Jock Mahoney, Shirley Patterson, William Reynolds, Henry Brandon and Douglas Kennedy

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.