The Neptune Factor (1973) is a Action, Science Fiction film that follows when an underwater ocean lab is lost in a earthquake, an advanced submarine is sent down to find it and encounters terrible danger. The Neptune Factor is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 5.1 out of 10 from 54 votes. Fans of action movies may also want to explore similar titles below.