简介：Agroupofdiverseindividualsaresuddenlytakenfromtheirhomesandflownviahelicoptertoafuturisticbombshelterinthedesert,one-thirdofamilebelowthesurfaceoftheEarth.There,theylearnthatanuclearholocaustistakingplaceandthatthey'vebeenchosenbycomputertosurviveintheshelterinordertocontinuethehumanrace.Theshelterisdesignedtoallowthepeopletoexistundergroundcomfortablyforyears,buttheyarefacedwithathreatnobodycouldhavepredicted:acolonyofthousandsofbloodthirstyvampirebatsfindsawayintotheshelterandlaunchesaseriesofviciousattackswheretheyclaimthehumansonebyone.