Search the Tangled Shore for Uldren and his Barons.
- Go through the door that is a narrow tunnel that will lead under the surface.
- This will lead you through to Four-Horn Gulch.
- Approach the terminal at the end of the hallway.
- Once again, approach and interact with the terminal in front of you.
- This will reveal another hidden passage in front of you.
- The wall will fall away to reveal a number of Raiders.
- Follow the canyon to its end, fighting through the Raiders.
- As you get toward the end of the canyon, a Corrupted Raider will drop from the lip to ambush you.
- Defeat it and leave the canyon, arriving properly in the Four-Horn Gulch.
- Continue forward toward the jagged rocks in front of you.