Only odd episodes (the ones showing the investigation and filmed in colour) were shot using 16 mm film. The even episodes were shot using digital camera.
Another special feature of the project is that all footage was shot using 16mm film. This helps to enrich the visual spectacle and create a special atmosphere - a method used by many creators in their TV serials, such as the new season of David Lynch's Twin Peaks, American Horror Story, True Detective, The Walking Dead and Breaking Bad.