1) 127 Hours tells the true story of Aron Ralston who was trapped by a boulder in a canyon in Utah for 5 days before cutting off his own arm to escape.
2) Sanctum follows a team of underwater cave divers on a treacherous expedition in Australia's largest cave system who become trapped when a storm hits and must search for an escape route to the sea.
3) Inception is about a thief, Cobb, who specializes in stealing secrets from peoples' subconscious during dreams. He is offered a chance at redemption if he can perform "inception" which is planting an idea in someones mind rather than stealing it.