一群女学生和她们的讲师诺拉在一个炸弹掩体里扎营，为她们正在撰写的论文做研究。在一个长相阴险的看门人的护送下，女孩们准备在地堡中度过二十四小时。半夜，其中两人消失得无影无踪。诺拉负责协调搜寻工作，但很快，幸存者就发现自己被困在了一个暴力漩涡中，而这个暴力漩涡正是一个噬人怪兽所为。

Can an adventure turn into the worst nightmare ever? Some university students let themselves be convinced by their teacher to live an adventure inside an anti-atomic bunker, in order to acquire useful information for their theses. The temperaments and diversities resulting from the girls' heterogeneous social backgrounds ensant an interesting, but, at the same time, complicated weekend. A sinister caretaker accompanies them to the heart of the bunker, considered one of the safest places in the world, from which they will not be able to get out for twenty-four hours. Amid amazement and restlessness, women camp in a fetid improvised dormitory. But during the night two of them disappear. Nora, the teacher, coordinates the research, which will soon suck the group into a deadly vortex concocted by the madness of a ferocious anthropophagus who, with unprecedented violence, disfigures them one by one and devours them.