Follow the Trinity Helicopter to the Soviet Weather Station
You regain control at the Copper Mill Bridge Base Camp. Talk to Sofia on the radio, and then open a Strongbox that’s beside the campsite. You find a set of Broadhead ClimbingArrows. They’ll come in handy on the path ahead.
Use your new Climbing Arrows on the wooden planks nearby. They glow when you use Survival Instincts, so spotting them doesn’t take long. Make two platforms for yourself and then climb to the top of the wall.
Examine a Mural partway up, and then use zip lines to traverse almost half of the map! It’s a fun ride that gets you most of the way over to the next waypoint.
Run the rest of the way to the objective. You need the Climbing Arrows again when you arrive. The wall leading toward the next map has to be climbed with your new tools. Put a few Arrows into the wall and use them to reach the top. Search the area above for a Document (Separated). Close by, there is also a Strongbox!
A Survival Cache is on the main path that leads out of the region, so look for its telltale glint while you explore. The cache is only feet away from an Explorer Satchel.
Seek shelter in a cave at the top of the pass. Another storm is coming in hard, and Lara can’t survive the night without some refuge. Inside the cave, she finally gets to rest.