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The Neptune Factor (1973)

G | | Sci-Fi | 3 August 1973 (USA)
When an underwater ocean lab is lost in a earthquake, an advanced submarine is sent down to find it and encounters terrible danger.




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Cast overview, first billed only:
Cmdr. Adrian Blake
Dr. Samuel Andrews
Chief Diver Don MacKay
Dr. Leah Jansen
Diver Bob Cousins
Chris Wiggins ...
Capt. Williams
Dr. Hal Hamilton
Diver Dave Moulton
Leslie Carlson ...
Brigs, Triton Radioman
Diver Phil Bradley
Ed McGibbon ...
Dr. Norton Shepherd
David Renton ...
Warrant Officer
David Yorston ...
Diver Stephens
Diver Thomas


Aboard the R/V Triton, the Project Neptune team is doing oceanographic research. Director Andrews is trying to keep the research going in spite of opposition from Foundation Head Sheppard. Below on the ocean floor, in the Sealab, the team led by Hamilton is about to return to the surface when the Sealab is ripped loose from it's moorings and sent careening into a trench. Trapped too deep for divers, the only chance is rescue by a new US Navy mini-sub, piloted by the arrogant Cdr Blake USN. Blake, Chief Diver MacKay, Diver Cousins & Dr. Jansen (Hamilton's fiance) dive in the mini sub to attempt the rescue of the trapped Hamilton & crew. Written by Robb Mavins <rmavins@mb.sympatico.ca>

Plot Summary | Add Synopsis






G | See all certifications »




Release Date:

3 August 1973 (USA)  »

Also Known As:

Conquest of the Deeps  »

Filming Locations:


Box Office


CAD 2,500,000 (estimated)

Company Credits

Show detailed on  »

Technical Specs


Sound Mix:


Aspect Ratio:

2.35 : 1
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Did You Know?


More than forty technical consultants from the Canadian Armed Forces, the Bedford Institute of Oceanography, and the Royal Ontario Museum as well as representatives from industries involved in various aspects of the undersea world participated in the making of this film. See more »


A black-suited diver is briefly shown assisting 2 others to depart from the lab in a mini-sub. He's not one of the characters, and disappears from the scene when the next diver (Yvette Mimieux) exits the lab to follow the sub. See more »

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User Reviews

There's A Hole In The Bottom Of The Sea--And This Movie Fell In It
3 February 2008 | by (Biloxi, Mississippi) – See all my reviews

I was completely unimpressed with THE NEPTUNE FACTOR when I, then all of twelve years old, saw the movie in its original 1973 theatrical release. When I discovered the film available on DVD, I decided to revisit it on the chance that it had simply been over my then-youthful head--and upon seeing it again realized that I was a pretty good judge of films even way back then. Simply put, THE NEPTUNE FACTOR bites a big one.

The plot was hackneyed even in 1973: an earthquake shakes up an undersea lab and a "special submarine" is dispatched to find out what has happened down there. They go down, down, down to the bottom of the sea, they look out the submarine window, and they see... some really big fish. Yep, that's about all there is to it. They look at some really big fish.

Now, the cast itself isn't bad at all. After all, it includes Walter Pigdeon, Ben Gazzara, Ernest Borgnine, Yvette Mimieux--and they are very capable players. And they give it their all, but they just can't get a lot of mileage out of it, particularly when the really big fish are just really big (and pretty grainy) close ups of little fish that you might find in somebody's home aquarium. And then there's the submarine itself, which is clearly a plastic model, and which seems to have filmed at the bottom of a kiddie wading pool with some plastic seaweed stuff thrown in.

If this sounds boring, well, it is. Now and then a really bad film can become accidentally entertaining. It may be so bad that it's astonishing, as in PLAN 9 FROM OUTER SPACE. It may be so bad that it's endearing, like ATTACK OF THE 50 WOMAN. But most bad films are just dull and boring, and when it comes to dull and boring THE NEPTUNE FACTOR is working hard to lead the pack. Give it a miss.

GFT, Amazon Reviewer

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