O Buraco (2006)

Miguel, a Civil Engineer and workaholic, goes to work on Christmas day as he does every day of the week. But this Christmas day will be unlike any other. An accident lands Miguel alone and stranded inside a construction hole on the building site. With no signal on his mobile and nobody around Miguel looks inside his briefcase hoping to find something, anything that might help get him out of his hole. In his briefcase he finds a strange letter, a letter that leaves him with one burning ambition - get home.