Voyage to the Bottom of the Sea : The Amphibians (1965)
Directed by Felix E. Feist
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Synopsis by Bruce Eder
The Seaview investigates mysterious events at the XP-1 undersea research laboratory. Nelson (Richard Basehart and Crane (David Hedison) discover that the scientists in charge, Dr. Winslow (Curt Conway) and Dr. Jenkins (Skip Homeier), have developed artificial gills, and have used their crew to create a race of water-breathing humans. And they plan on taking over the Seaview and use it to spread this new race across the globe.