"Metallic Monks"
In the fullness of time the bunker became our home, our temple and our salvation from the terrors of the outside world. We began to build and shape our fortress into something glorious, the beauty of which the technologically bereft world had never seen before.Sophia's tape.

The Lost Hills is a pre-War government bunker in Southern California and the headquarters of the Brotherhood of Steel, located in the deserts west of Junktown and the Hub, directly southeast of the Mariposa Military Base. Mysterious and impenetrable, it is the subject of myths and legends among many wastelanders.


The Lost Hills base can be found four squares west and eight squares south of Vault 13.


The Lost Hills bunker had been originally constructed to house members of the government of the United States. Although this facility was completed before the Great War (2077), none of its intended inhabitants had actually managed to reach it.

Eventually, the bunker was re-settled by the soldiers from the Mariposa Military Base commanded by Captain Roger Maxson in an event called the Exodus. Maxson and his men were originally serving as a security detail for scientists working on FEV. Having discovered the atrocities performed in the name of science during FEV research, they executed all the scientists and declared themselves to be in full desertion from the US Army. Three days later, the Great War ended two hours after it started.

After burying the scientists in the wastes outside of Mariposa, the soldiers sealed the military base, then headed out into the desert, taking supplies and weapon schematics with them. In November 2077, the captain and his men, together with their families, had arrived at the Lost Hills, suffering many casualties along the way, including Maxson's wife (but not his teenage son). The Lost Hills bunker became the headquarters of the newly formed Brotherhood of Steel.

The installation was renovated and maintained by the Brotherhood for years, as they steadily gathered technology to preserve and research. After the events of Fallout (2161–2162), the installation became a major research and development house, staying out of the politics of New California and aiding the newly formed NCR, eventually becoming the heart of an autonomous state, Maxson.


Fo1 Losthills Entrance

The Entrance

Lost Hills was a pre-War government security bunker. Located almost entirely underground, the only indication of the presence of this installation was a small, reinforced structure containing the primary access elevator. After the Brotherhood seized the location, two sentries in power armor stood guard at the entrance at all times. One, a man named Cabbot, begins the become an initiate quest.

Guard patrols in power armor routinely patrol the area around the bunker and the surrounding wastes. An encounter with them will usually result in thorough questioning and likely temporary arrest for trespassing on their land.

Level 1

Fallout Lost Hills Level 1

Level 1

The first underground level contains the main supply room (filled to the brim with pre-War technology). The stockpile, while full of technology, is rather limited - every brother can withdraw only a single set of armor, while higher tier weapons are given only to those with special clearances from Senior Paladin Talus (or another high ranking officer).

Opposite the storeroom is the training chamber, where initiates exercise and learn combat skills under the careful guidance of the best fighters of the Brotherhood. The head instructor has his quarters located near the training room. Two other facilities are also present on the level - Head Paladin Rhombus's office and quarters and the guardroom, where surface guards spend their time when off-duty.

Level 2

Fo1 Lost Hills Level 2

Level 2

Level 2 houses the living quarters for initiates, their classroom and the facility's medical lab. The youngest members of the organization spend their time here, studying to become either a Knight or Scribe, under the watchful eyes of higher ranking members. Their quarters are quite cramped - up to twelve initiates share a room (or even more, if hot bunking is used), but fitted with all the necessary amenities.

The infirmary is well stocked with medical supplies and in 2161 it offered the best medical treatment across the entirety of New California. Apart from healing injuries and removing radiation and addictions for free, the Brotherhood's medical staff can perform human augmentation surgeries:

  • ST: $2000, 3 weeks
  • PE: $4000, 1 week
  • EN: $3000, 1 week
  • IN: $6000, 3 weeks
  • AG: $5000, 3 weeks

Level 3

Fallout Lost Hills Level 3

Level 3

Arguably the heart of the Brotherhood, level 3 houses the most important facilities - workshops, where technology is maintained and recreated by Knights and the libraries, where Scribes patiently study old blueprints and knowledge, preserving it for future generations. Their living quarters are also located on this level, design as spartan as the ones of the Initiates, although less cramped - only three persons are quartered per room.

In 2161, Master Scribe Vree spends a lot of her time in the libraries, researching vital subjects for the Brotherhood. Even her quarters are located in the library itself.

Level 4

Fo1 Lost Hills Level 4

Level 4

Housing the command center, mainframe and the Elders' quarters, if level 3 is to be considered the heart, level 4 is the brain of the Brotherhood. Unlike other members, the leaders of the Brotherhood each have their own quarters, sparsely furnished, ascetic even. Their conference room is located at the back of the auditorium, used often, despite their apparent inability to agree on anything (except that there's four of them, although even that was questioned).

The mainframe, processing and storage containing the collective knowledge of the Brotherhood, is located out of the way, behind the quarters, accessed through an airlock. Interestingly, it isn't guarded by anyone, unlike the Elders' quarters and meeting room.


The denizens of Lost Hills are exclusively Brotherhood of Steel members, with only merchants and other essential contractors allowed inside for their services. Discipline is strictly maintained, and everyone is expected to fulfill their duties. While strict, it's also a fair society - brothers are treated equally, expected to respect other castes and, while highly disciplined, allowed room for friendship, camaraderie and romance.

Equipment-wise, castes can be easily identified:

Things to do

As with all the other locations, there are quite a few things to do in the bunker:

Level 1

Level 2

  • Get healed and de-radiated for free at the doctor.
  • Receive augmentations from the good doctor (see above for pricing and recovery times).

Level 3

Level 4

  • Receive the assignment to scout the Mariposa Military Base from John Maxson.
  • Receive gear for the assignment from Mathia (sniper rifle, rocket launcher, laser pistol, power fist, or Ripper).
  • Present the Mariposa report to the Elders and receive Brotherhood support for the attack on the base (or to Cathedral if link between Mariposa and Cathedral is found).

Related quests


Behind the scenes

  • In Fallout 3 during the Galaxy News Radio quest, after you defeat the super mutant behemoth, one of the Paladins will mention Lost Hills by saying, "That should give the boys at Lost Hills something to think about."
  • Lost Hills seems to be based off of the real life town of Lost Hills, California north of Bakersfield, where Vault 12 is located.
Icon cut contentThe following is based on Fallout cut content and has not been confirmed by canon sources.

Originally, Lost Hills was not a bunker - it was a small concrete building, found by soldiers from Mariposa that employed it as a base, and slowly, but steadily changed it into a true fortress. More information is in the original Vault 13 timeline.

The Brotherhood also had an invasion ending planned, where the super mutants march against the Brotherhood and lay siege to Lost Hills. While defending their fortress valiantly, a traitor, Kedrick, would assassinate the Elders and sell the Brothers to the super mutants. Lost Hills would be subsequently destroyed. An unused "Dead Brotherhood" map is still included in the game files and can be accessed via the main menu.

Other cut elements include a few non-player characters (notably a scribe mourning the Brotherhood's reluctance to explore "soft" sciences such as sociology or psychology), a romance subplot including Jennifer, the Paladin, another Michael-related subquest about pulse grenades and girls from lower levels and a day/night cycle in the bunker.

Icon cut contentEnd of information based on Fallout cut content.


See also

Lost Hills
Stroken BoS Emblem
BoS Flag FO3
Fo3NV Brotherhood
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