Once you get the Treasure, exit the cave and stand on the extended rounded ledge. Jump to grab the handhold on the wall from where you came and traverse to the left. Release to grab the lower ledge, then the handholds below. Jump to the left to reach the next handholds (above the flat ledge where you started climbing up the wall).

This time move upwards and to the left.

Grab the hadhold beneath the stone railing and traverse to the left.

When you reach the end, jump to grab the ledge behind you.

Pull up to hug the wall and walk to the right (Lara's left hand). When you reach the end, jump forward to land on the ground.