The Land Unknown (1957) Jock Mahoney, Shirley Patterson, William Reynolds, Douglas Kennedy, Director: Virgil W. Vogel , (Eng).

On a naval expedition to Antarctica, three men and reporter Maggie Hathaway crash-land in a crater 1000 m below sea level. There, they encounter steamy tropical forest, dinosaurs, carnivorous plants, and human footprints, as Maggie's clothes become more and more abbreviated.