In order to clear the Breached Rock Rebel Camp in Horizon Forbidden West, you must first find it. The Breached Rock rebel camp is almost exactly halfway between The Bulwark and The Memorial Grove. It has entrances on the south, north-east, and south-east sides, all of which are guarded but not particularly well fortified. Deal with the guards patrolling the perimeter with stealth kills and traps (or use your spear if subtlety isn’t your thing), then head in and up to the battlements patrolled by several rebel snipers. The snipers are prone to headshots and being easily rushed off and engaged in hand-to-hand combat.
Eventually you’ll draw the attention of a Rebel champion, so deal with him as usual (i.e. hit him hard in his shield until you can destroy him with a resonator blast, then hit him with relentless combos while he’s is unprotected). Loot his body to get a bunker key, then clear the rest of the camp.
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The bunker door is in the dark cave on the northwest side of the lowest level of the camp. Use the key to open the door, then you might want to set some traps in that area before going all the way inside. Either the enemies will fall into the traps, or the traps will at least keep the enemies from following you when you need to retreat outside. While only the champion is marked as a target, you really need to kill all three enemies in the bunker to have it all for yourself. They are all tough and dangerous so use your best weapons and skills here. Shock damage is particularly effective, as is the Firespitter weapon that the Gunner drops.
Next, you’ll need to use your focus to search the Command Center so you can find and examine a messaging device, a power cell, and some schematics. Then interact with the console to overload the power cell, destroy the bunker, and complete the Breached Rock Rebel Camp quest.
https://www.gamepur.com/guides/how-to-clear-the-breached-rock-rebel-camp-in-horizon-forbidden-west How to clear the Breached Rock rebel camp in Horizon Forbidden West