Buried (2010)

"170,000 sq miles of desert. 90 minutes of oxygen. No way out."

As an American civilian truck driver working in Iraq, Paul Conroy's convoy is attacked by a group of Iraqi insurgents. Some time later, Paul awakes in a coffin with only a lighter, a cell phone, and his ever-growing anxiety. Faced with a dwindling oxygen supply and a dying battery, he must fight panic, despair, and delirium as he races against time to escape the claustrophobic death trap.