According to director Scott Mann, the filmmakers considered green screen or digital sets, but ultimately opted for the real thing. They decided to build the upper portion of the tower on top of a mountain so that the actors would appear to be thousands of feet in the air, even though in real life they were never more than a hundred feet off the ground.[3] Currey and Gardner were offered stunt doubles, but they opted to perform their own stunts.[3][4] Filming was difficult, because often weather such as lightning and strong winds posed a challenge.[5][6] The film cost $3 million to produce.[7]