Head north-east. When you get to the closed door, pull it out with a rope arrow to unlock further way. After a while you'll find yourself in a room with cages in which wolves are kept; go up the ladder.
It's time for a small puzzle that will let you pass further into the wolf cave. Shoot a rope arrow at the deer to swing the whole structure.
Wait until a metal beam falls in front of you (screenshot), then leap twice quickly - first to grab onto the beam, then to reach the interactive wall. Make sure to use the climbing axe (reward: 100 XP).
Go through the subsequent areas towards the only available exit. Get ready to press the action button as soon as Lara finishes the downward slope. Pull up and go right.
Turn right at the fork (the left path will take you to an empty lair); you'll reach the exit and return to Shantytown. Slide down the zip-line and listen to another conversation (reward: 900 XP).