Move to the end of the ledge and look down on the right.
Shoot a rope arrow into the rope-wrapped whatsis below and pull.
This rotates a second jury-rigged armature.
Meanwhile, the buoy continues to float downstream below where you're standing. It bumps into the lower horizontal bar on the armature and pushes it around a little farther.
Watch the horizontal bar on the top of the armature.
When it moves around in front of you, jump to grab it...
...and then quickly jump again...
...and press Interact to latch onto the climbing wall with your axe. If you don't make it the first time, return to the wheel near the campsite and try again.
When you reach the climbing wall, climb to the top and go through the red doorway.
Follow the passage to the Treasure Chest. Opening it gives you the usual 1250 XP and 250 salvage points, plus a HANDGUN PART (3/3) and the Shipwreck Beach GPS Cache Map.
NOTE: If you've raided all of the previous Challenge Tombs as well, you'll unlock the Intellectually Superior Achievement/Trophy now as well.
Move up the wooden ramp on the right and slide down the zip line to the dock. Pick up more arrows if you need them. Use the Day Camp to make any skill and weapon upgrades you can afford. Then follow the tunnel back to Shipwreck Beach.
[Part 1 |Return to the Shipwreck Beach Walkthrough]
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