The Land Unknown

The Land Unknown 1957 is a science fiction CinemaScope adventure film about a naval expedition trapped in an Antarctic jungle. The story was allegedly inspired by the discovery of unusually warm water in Antarctica in 1947. It starred Jock Mahoney and Shirley Patterson and was directed by Virgil W. Vogel. The film is notable for its lowbudget special effects, which include men in dinosaur suits, puppets and monitor lizards standing in for dinosaurs. William Reynolds recalled the studio spent so much money on their mechanical dinosaur that they couldnt afford to shoot the film in colour as they first planned.

The crew meet Hunter, the lone survivor of a plane crash from the 1947 expedition. He has learned to survive in this land with the aid of a conch that drives off the animals and by raiding the dinosaurs nests. He offers the remains of his airplane to repair the helicopter, but only if the crew agree to leave Maggie with him. The crew refuses, but they also know that afterdays their ship will have to leave before the Antarctic winter sets in. Unsuccessful in finding the remains of the plane, hidden by Hunter, the crew debate leaving Maggie, or forcing the information out of Hunter by torture. Commander Roberts refuses to sink to either low. Maggie is later attacked by an Elasmosaurus Hunter rescues her. After a fight and learning that the crew refuse to torture him for the location of the plane, Hunter gives them the map to its location.After repairing the helicopter the crew take off in a hurry as a Tyrannosaurus Rex attacks their base. They fly to pick up Maggie, who is with Hunter at the time. Hunter is ambushed by the same Elasmosaurus that leaps out of the water, and the crew come to his rescue. They fly out of the lost world with Hunter. Once clear of the crater they are able to radio their ship and are guided in. Their fuel exhausted, their helicopter crashes into the water ocean before getting to the ship. They are rescued, and once safely on the ship Harold and Maggie declare their love to each other.. ........

Source: Wikipedia