Prehistoricsand-dwellingsharksareunleashedontheislandofWhiteSandswhenanunderwaterearthquakecracksopenacraterdeepbeneaththeoceansurface.Themostmenacingbeatstoeverrulethewatersnowrulethesand;withtheirmonsterappetitiestheymercillesslyfeastonanythingthatcrossestheirpathMarkAtkinsdirectsthissci-fi'creaturefeature'horror.Whenanunderwaterearthquakeopensupadeepcraterontheoceanfloor,aprehistoricbreedoflethalsand-dwellingsharksisunleashedupontheunsuspectingresidentsofWhiteSandsIsland.