A few people get killed by someone unknown. One guy goes missing, they find him murdered outside in a pool of blood frozen. I got the feeling that the murder was done by a human, not a monster, but cannot be sure.
One scene, one of the leaders comes into a hut to fix the plumbing , some pipes, and he has to climb a few stairs to reach the pipes. These pipes were right in the open , in the same space the experiments were taking place.