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During World War I, a German U-boat sinks a British passenger ship and takes the survivors aboard. After getting lost in fog, the submarine surfaces near the unknown island of Caprona, a lost world where they find dinosaurs and Neanderthals.
Featured Crew
| Michael Moorcock | Screenplay |
| Kevin Connor | Director |
| James Cawthorn | Screenplay |
| Edgar Rice Burroughs | Novel |
| John Peverall | Associate Producer |
| John Ireland | Editor |
| Maurice Carter | Production Design |
| Bert Davey | Art Direction |
| Milton Subotsky | Producer |
| Robert H. Greenberg | Executive Producer |