Buried (2010)

A civilian truck driver in Iraq, Paul Conroy (Ryan Reynolds) falls victim to a band of insurgents. An unknown length of time later, Paul awakes in a coffin, with little more than a lighter, a cell phone, and his ever-growing anxiety. Faced with a dwindling oxygen supply and a dying battery, Paul must fight panic, despair and delirium as he awaits a rescue that might not arrive in time.