Voyage to the Bottom of the Sea : Turn Back the Clock (1964)
Directed by Alan Crosland / Alan Crosland Jr.
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Synopsis by Bruce Eder
The Seaview rescues a survivor (Nick Adams) from an Antarctic expedition who seems to be suffering tropical exposure, and claims to have seen live dinosaurs. Nelson (Richard Basehart) and Crane (David Hedison) find a prehistoric veldt, filled with creatures presumed to have been extinct for millions of years. They uncover the truth about the fate of the other members of the expedition, but are trapped by the newly active volcano towering over the primordial veldt.