Cananadventureturnintotheworstnightmareever?Someuniversitystudentsletthemselvesbeconvincedbytheirteachertoliveanadventureinsideananti-atomicbunker,inordertoacquireusefulinformationfortheirtheses.Thetemperamentsanddiversitiesresultingfromthegirls'heterogeneoussocialbackgroundsensantaninteresting,but,atthesametime,complicatedweekend.Asinistercaretakeraccompaniesthemtotheheartofthebunker,consideredoneofthesafestplacesintheworld,fromwhichtheywillnotbeabletogetoutfortwenty-fourhours.Amidamazementandrestlessness,womencampinafetidimproviseddormitory.Butduringthenighttwoofthemdisappear.Nora,theteacher,coordinatestheresearch,whichwillsoonsuckthegroupintoadeadlyvortexconcoctedbythemadnessofaferociousanthropophaguswho,withunprecedentedviolence,disfiguresthemonebyoneanddevoursthem.