Vittnet måste tystas was released in the year 1981。Vittnet måste tystas is also called as Blow Out, Blow out - Der Tod Löscht alle Spuren, Blow out - O dolofonos tou mesonyktiou, Impacto, Blow Out - viimeinen todistaja, Wybuch, Um Tiro na Noite。
This stylish Brian DePalma thriller plays off the theme of the unsuspecting witness who discovers a crime and is thereby put in grave danger, but with a novel twist. Jack is a sound-man who works on "Grade-B" horror movies. Late one evening, he is "sampling" sounds for use on his movies, when he hears something unexpected through his sound equipment and records it. Curiosity gets the better of him when the media become involved, and he begins to unravel the pieces of a nefarious conspiracy. As he struggles to survive against his shadowy enemies and expose the truth, he doesn't know who he can trust.