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An earthquake in the Salton Sea unleashes a horde of prehistoric mollusk monsters. Discovering the creatures, a Naval officer and several scientists attempt to stop the monsters, but they escape into the canal system of the California's Imperial Valley and terrorize the populace.

Directed by: Arnold Laven
The cast includes: Tim Holt (Lt. Cmdr. John ''Twill'' Twillinger), Audrey Dalton (Gail MacKenzie), Hans Conried (Dr. Jess Rogers)
MPAA rating: , Running time: 83 minutes
Presented in: Color
Related categories: Atomic SciFi, Monsters on the Loose, Nature Runs Amok, Undersea, Would be great in Color!