For four urban explorers, a weekend of male bonding in the Appalachian back woods turns into a fight for survival against nature and the brutality of man.
Given most of the action takes place during the day, Academy Award-winning cinematographer Vilmos Zsigmond opted to use natural daylight for the bulk of the shoot. One exception comes towards the final act, in a scene where two of the leads attempt to evade danger by scaling a cliff at night. This scene was actually filmed in broad daylight, using the ‘day for night’ technique. This is where a nighttime scene is filmed, underexposed, in full daylight, but darkened in post-production, often with a blue tint added.
Zsigmond’s cinematography is often credited for maintaining a growing sense of menace and danger throughout the film, despite mostly being set in daylight hours.