sentences:  Many of the scenes were filmed at Riverview Hospital, a psychiatric hospital located in Coquitlam, British Columbia.During on-site production, several of the members of the show's cast and crew claimed that they heard mysterious voices, and they refused to "venture into the bowels of the building" for fear that it was haunted.In order to film the scene featuring the bathroom door bursting with water—a scene Matt Hurwitz and Chris Knowles called "nail-biting"—special effects supervisor Dave Gauthier built a massive tank that was rigged to flood the set hallway with 3,300 gallons of water.