I'll start it off with these three.
Buried (2010) - After an attack by a group of Iraqis, U.S. truck driver working in Iraq wakes to find he is buried alive inside a coffin. With only a lighter and a cell phone it's a race against time to escape this claustrophobic death trap.
Frozen (2010) - Three skiers stranded on a chairlift are forced to make life-or-death choices, which prove more perilous than staying put and freezing to death.
Sanctum (2011) - A team of underwater cave divers on a treacherous expedition to the largest, most beautiful and least accessible cave system on Earth.
How about you?