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CONTAINS SPOILERS
Chapter 6: Looking For Trouble / Get Across The River
After freeing the trapped alien, return to the Campsite using the Navigation Beacon. Across the river in Desolate Valley you'll see a path with mushroom-like platforms. Make your way across and enter the cave. You'll reach a glowing circular gate. Use the key you received earlier and insert it into the panel to the right of the gate. Enter and proceed onto the Garden Trail.