Hidden Valley Hidden Valley is in a fenced - in area nestled between hills and rocks roughly northeast of the NCR Correctional Facility ( NCRCF ) and southeast of Sloan . The valley is home to numerous bark scorpion s and remnants of the Mojave chapter of the Brotherhood of Steel that once occupied HELIOS One before being defeated by the NCR during . Background . < section begin = " background " / > Hidden Valley is a complex of USAF bunkers remaining from before the Great War near the heart of the valley . Abandoned even before the war , the area around the bunkers is littered with junk . Signs on the roads and peaks leading into the valley mark the boundaries of the complex . Stretches of drooping pre - War wire fences also note the area as being USAF restricted . who have returned from Hidden Valley have reported four bunkers , each with an intercom system , but complete silence in response to any calls on the intercoms . Furthermore , prospectors have reported an eerie feeling upon entering the complex . Others tell of seeing armored figures exiting the Valley from within a raging sandstorm that seems to arrive every evening and stay for the night . < section end = " background " / > Layout . Hidden Valley can be accessed via the road near Sloan and at the northwest and southeast corners where the fence is down . There are also small side - paths , at least one of which is heavily inhabited by bark scorpion s and the occasional when going in the direction of scorpion gulch nearby . A with a heart and anti - bomb symbol painted on it will be directly in front of the player character when fast - traveling to Hidden Valley . Inside the fenced area , four bunkers are spread around the perimeter of the area . Three of the four bunkers are just a large entry room with a locked door on the opposite side that leads to nowhere , but may contain some notable loot . The entry room has two skeleton s on a sleeping mat with a bottle of and a , which suggests a sad story . There is also a campfire . The locked ( Easy ) door in this bunker hides a hundred s and anywhere between twenty and twenty - four . At the end of the room behind the locked door ( Average ) is a pair of s , a and some 5 . 56mm rounds . There are two disarmable s in the entrance hallway hanging from the ceiling , and a third out of reach near the middle of the entry room . The entry room also contains a sleeping pad and a sack , along with a journal indicating that someone is using the bunker as a safe house . The locked ( Hard ) door here opens the way to three ammunition box es , a mini nuke hidden under a tin plate , a steam gauge assembly and two pieces of scrap metal on the right , and some s and 5 . 56mm rounds on the left . Buildings . If the Courier entered the west bunker ( below ) without Veronica as a companion , they will be assigned a task to remove an NCR ranger from this bunker . After dealing with the ranger OR making contact using Veronica OR answering the summons for ED - E , a trip - wire triggering the grenade bouquets will appear in the entry room door , along with more entry room grenade bouquets ( one to the left is disarmable ) . The entrance hall grenade bouquets previously mentioned will also respawn if disarmed earlier . The fourth bunker , also known as Hidden Valley bunker , is the home of the Brotherhood of Steel . The bunker is marked by a small broken tree stump directly on top of the dome . It is not possible to gain access to the bunker without acquiring the holotape containing the passphrase from either the two dead Brotherhood of Steel paladins at the REPCONN headquarters , the dead Brotherhood soldier near Black Mountain , or the two dead Brotherhood soldiers in a ditch on the artillery - battered area outside Nellis Air Force Base . With the holotape and passphrase , an option will be given to say it into the intercom . Otherwise the lock ( Very Hard ) can be picked . Alternatively , the door can be opened with Veronica present . Access can also be granted through the quest or by advancing far enough in any storyline to be asked to interact with the Brotherhood of Steel . Related quests . < section begin = " quests " / > Appearances . Hidden Valley appears only in " " .