Antrum: The Deadliest Film Ever Made (DVD)
Canadian horror movie. It's pretty terrifying!
A documentary crew find a 1970s film about teenage siblings Oralee and Nathan who attempt to revive their pet dog which they believe is suffering in Hell and their efforts result in a portal being opened to the underworld.
However, when the film is screened the audiences are confronted by evil and the blurring of fiction and reality could be the difference between life and death.