During World War I, a German U-boat sinks a British ship and takes the survivors on board. After it takes a wrong turn, the submarine takes them to the unknown land of Caprona, where they find dinosaurs and neanderthals.

Cast:Doug McClure, John McEnery, Susan Penhaligon, Keith Barron, Anthony Ainley, Godfrey James,

Genre:Adventure, Fantasy, Science Fiction,

country:United Kingdom, United States of America,

Production:Land Associates, Amicus Productions, Edgar Rice Burroughs Inc., British Lion Films, American International Pictures,