Zero Kelvin (1995)

No matter where you put people, they still have the urge to be human. So take three people, stick them out in a small shack in a barren, freezing, uninhabitable snow field and expect them only to focus on their work. The mood swings of the people eventually turned huge and sudden. Just as comfort sat over the cabin and everyone seemed to get along, one crack, one line of dialogue would shatter everything and send someone mentally overboard. At one point the film gets outside the cabin, but its no less claustrophobic. The best moment? The birthday. An excellent film.