I don't see credit given to the true experience of Roy Hallums who, in 2004, while a contractor in Iraq was captured by terrorists and buried alive. His incredible story is worth finding and reading.That said, the movie version of this similar story is a masterpiece of clever filmmaking. Everything takes place inside a coffin-like box. Ryan Reynolds is terrific as the encased victim and director Rodrigo Cortés captures everything with a creative use of unexpected camera angles and masterful lighting, sound design and editing. The move never cuts away to flashbacks or actions above ground. As one might expect, this taut tale is extremely claustrophobic, and utterly terrifying. In many ways, this movie, though confined to a single location, kind of reminded me of an Indiana Jones set piece. But it's really more like a Hitchcock murder mystery about a victim in a box instead of a locked room.