Frozen Alive
Der Fall X701 (original)
Starring Mark Stevens, Marianne Koch, Wolfgang Lukschy, Joachim Hansen, Delphi Lawrence, Walter Rilla, Helmut Weiss, Albert Bessler, John Longden, Sigurd Lohde
It's a drama and mystery movie, and has a rating of 4 out of 10 from Imdb which is fairly low for this kind of movie.
Watch it here
Not found streaming from Belgium.