Land of Silence and Darkness
Land des Schweigens und der Dunkelheit (original)
Starring Fini Straubinger, Heinrich Fleischmann, Vladimir Kokol, M. Baaske, Resi Mittermeier, Rolf Illig
It's a documentary movie, and has a rating of 7.9 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Italy.