A Lonely Place to Die (2011) on Netflix

The mountain climbers Rob, Ed, Alison, Kate and Alex are best friends. While hiking in the Scottish Highlands, they find a vent pipe and a Serbian girl named Anna buried in the wilderness in a small compartment. They rescue Anna and split in two groups: Rob and Alison takes a shortcut to reduce the distance in 25 km climbing a difficult rock to go to the police and request a helicopter while Ed, Alex and Kate walks with Anna through a path along 48 km to the next village. But soon they are chased by the cruel kidnappers and they try to save their lives.