The Neptune Factor is a 1973 science fiction film directed by Daniel Petrie, featuring underwater cinematography by Paul Herbermann. The film's special effects utilized underwater photography of miniatures with actual marine life. Marine scientists prepare to leave their underwater Sealab after an extended stay performing oceanographic research. An underwater earthquake interrupts their plans. Dr. Andrews enlists experimental sub captain Adrien Blake to survey the damage and rescue the oceanauts. Taking Chief Diver "Mack" MacKay and Dr. Leah Jansen , fiancée of one of the scientists,... in the sub, Blake finds the lab has been ripped from its moorings and tumbled down an unexplored, deep ocean trench, presumably intact. With time running out , the team descends into the unexplored trench, and finds an incredible ecosystem populated with monstrously over-sized fish. After surviving encounters with unfriendly denizens, they find the lab partially intact, the surviving scientists breathing from scuba tanks, and fending off giant, hungry eels.
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| Release date: | August 3, 1973 |
| Directed by: | Daniel Petrie |
| Rated: |  |
| Runtime: | 98 Minutes |
| Producer: | Sandy Howard |
| Music by: | Lalo Schifrin |
| Genre: | Adventure, Science Fiction, Disaster |