Such capacity was believed to be well outside the United States' closest competitors, but the bunker was provided with additional protection in the form of the Dervish camouflage system.

The bunker was built several hundred feet (over 100 meters) below ground, beneath multiple layers of reinforced materials in order to ensure that nothing short of a direct hit by a bunker-busting megaton nuclear weapon could threaten the installation.

The facility was intended for use by high ranking personnel and other VIPs as a shelter and command center in crisis situations. The USAF selected the remote Hidden Valley to establish an independent, self-sustaining underground bunker, using the same technology used at Raven Rock. The perception changed little after the Great War, with wastelanders seeing it as little more than a stretch of particularly desolate wasteland, home to derelict bunkers, mute intercoms, and bark scorpion. To the casual observer, it was just a stretch of federal land, cordoned off, abandoned, and covered in graffiti protesting the futility of the Sino-American War. The secrecy of project likely so buried in bureaucratic red-tape that no one who could've used it knew about it. The United States Air Force declared it a testing range, surrounding the area with a chain-link fence, forbidding photography, and then completely forgot about it.

However, with hostilities escalating across the globe and the Sino-American War continuing with no end in sight, it fell prey to the military-industrial complex. Once one of the most pristine natural basins in the McCullough Range, Hidden Valley was a destination for hikers wishing to experience the untamed wilds of Nevada. The following section is transcluded from Hidden Valley.

Killing brotherhood of steel fallout 4