 In the United States the film remained unseen in the US until 1984 , when Bedford Entertainment briefly released a heavily edited version under the title Unsane . It was approximately ten minutes shorter than the European release and was missing nearly all of the film 's violence , which effectively rendered the numerous horror sequences incomprehensible . In addition , certain scenes that established the characters and their relationships were excised , making the film 's narrative difficult to follow . This version of Tenebrae received nearly unanimously negative reviews . 
