An Avalanche

You were travelling in the mountains of Andorra, when suddenly a snow storm hit you. Your chances for survival seemed slim, but suddenly you saw an abandoned hut in front of you. But as soon as the door closed behind you, avalanche descended, and the door was blocked with snow. You can't wait the storm out in the hut, and there is not enough fuel in the generator, so it will only last for one hour. You have to repair an old radio and to call for rescue as soon as possible. But in some time you come to an awful understanding: there is something wrong with this house, and awful things are happening in it!