The Neptune Factor (1973)

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When an underwater ocean lab is lost in a earthquake, an advanced submarine is sent down to find it and encounters terrible danger. (IMDb)
An exciting enough undersea rescue premise here is expanded upon to be anything but, with the decent drama accompanying the initial catastrophe being slowly snuffed out by a terribly slow-paced rescue mission that somehow ends up being more about silently gazing at “giant” pet store fish then rescuing their comrades, while the dangers of water pressure and a depleted sub battery are stated and then promptly ignored without explanation in the inconsequential climax. A badly made and boring film.
4.5/10 (Bad)

The Poseidon Adventure (1972)

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A group of passengers struggle to survive and escape when their ocean liner completely capsizes at sea. (IMDb)
Five trivial character set-ups converge at a fancy New Years cruise ship party as scenes with the captain and crew increase in frequency as the foretold disaster (see the opening story summary) draws near: It’s a straight-forward and effective opening act that leads naturally to the “rag-tag group of survivors” disaster adventure plot. The pace is slow (realistic, but tiresome at points) but it’s offset in part by the well-defined characters (marred only by Hackman’s eye-rolling macho overload).
7/10 (Good)