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One hundred miles off the coast of Puerto Rico, a top secret experiment too dangerous to be conducted on land is being conducted aboard the U.S. nuclear attack submarine Sam Houston-an experiment that has gone horribly wrong.A predator is loose in the Sam Houston-a microscopic killer that strikes without warning, driving its victims to terrifying heights of violent, self-destructive insanity.Soon madness and terror reign eight hundred feet below the ocean's surface, as those infected race to defeat the silent killer-unaware that another enemy follows in their wake. A diesel submarine relic is pursuing nuclear-powered Sam Houston into a final, deadly confrontation in the deepest waters of the Atlantic.