Hidden Valley

Hidden Valley is a location in the Mojave Wasteland in 2281, situated 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 scorpions and remnants of the Mojave chapter of the Brotherhood of Steel that once occupied HELIOS One before being defeated by the NCR during Operation: Sunburst.

Background
Hidden Valley contains several pre-War USAF bunkers. Signs on the roads and fences leading into and around the valley mark the boundaries of the complex. Prospectors who have returned from Hidden Valley have reported four bunkers, each with an intercom system that garners no response. 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. The area is protected by the DERVISH camouflage system which serves as a cloaking mechanism, protecting any high-ranking VIPs, in the safehouse bunkers underground. In the event that the location was threatened, the bunker's DERVISH camouflage system would make targeting the site impossible for automated systems.

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 scorpions and the occasional giant radscorpion when going in the direction of scorpion gulch nearby. A hollowed-out rock 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 contain a large entry room with a locked door on the opposite side that leads to nowhere but may contain some notable loot.

Bunkers
East

The entry room has two skeletons on a sleeping mat with a bottle of wine and a suitcase, which suggests a sad story. There is also a campfire. The Easy locked door in this bunker hides a hundred 5mm rounds and anywhere between 20-24 5.56mm rounds.

North bunker

At the end of the room behind the Average locked door is a pair of mini nukes, a stimpak and some 5.56mm rounds.

South bunker

Two grenade bouquets can be disarmed 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 Hard locked door here opens the way to three ammunition boxes, a mini nuke hidden under a tin plate, a steam gauge assembly and two pieces of scrap metal on the right, and some frag grenades and 5.56mm rounds on the left.

If the Courier enters the west bunker 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 can be disarmed). The entrance hall grenade bouquets previously mentioned will also respawn if disarmed earlier.

West bunker

The fourth bunker, also known as the 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 Very Hard lock can be picked. Alternatively, the door can be opened with Veronica present. Access can also be granted through the quest Wild Card: Side Bets or by advancing far enough in any storyline to be asked to interact with the Brotherhood of Steel.

Related quests
 

Appearances
Hidden Valley appears only in Fallout: New Vegas.