Agroupofdiverseindividualsaresuddenlytakenfromtheirhomesandflownviahelicoptertoafuturisticbombshelterinthedesert,one-thirdofamilebelowthesurfaceoftheEarth.There,theylearnthatanuclearholocaustistakingplaceandthatthey'vebeenchosenbycomputertosurviveintheshelterinordertocontinuethehumanrace.Theshelterisdesignedtoallowthepeopletoexistundergroundcomfortablyforyears,buttheyarefacedwithathreatnobodycouldhavepredictedacolonyofthousandsofbloodthirstyvampirebatsfindsawayintotheshelterandlaunchesaseriesofviciousattackswheretheyclaimthehumansonebyone.
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