Wolf's Hole (1987)

In this Czech political allegory-cum-sci-fi-horror adventure, ten teens from different schools find themselves chosen to take part in a special skiing workshop in the mountains. On the day of the seminar, eleven young people, each bearing an invitation, arrive. A massive avalanche occurs and the ski-lodge is cut off from outside contact. Unfortunately, food supplies are limited and the three instructors strongly advise that the youths work together to make do or choose someone to leave. Time passes and soon the kids learn that their “teachers” are not what they seem to be.