Federal Surveillance Center K-21B

Federal Surveillance Center K-21B, located underneath an abandoned shack, is a location in the Commonwealth in 2287.

Background
Federal Surveillance Center K-21B was a surveillance facility used by the government before the Great War. The bunker was also a contingency plan and would serve as an outpost for government surveillance workers who were meant to continue their work well after the bombs fell. Not many workers made it to the bunker - a holotape recorded by an employee named Jeff Buzensky can be found on an employee's desk detailing the fall of the bunker and the death of his coworker Bill Stevens, who was a mere few steps away from the entrance after leaving to retrieve his personal effects from his vehicle. The shelter was not stocked with enough food due to budget cuts, and its inhabitants eventually died of starvation.

Layout
On the outside of the facility, the abandoned shack has some highly irradiated water and nuclear waste barrels. The inside of the shack contains a locked trapdoor to the cellar next to Bill's skeleton and his suitcase, containing the key. The cellar leads to a large underground bunker with a large open shaft passing through the middle of the bunker. Up to three synths inhabit the bunker, one of which is a synth leader.

On the bottom floor of the bunker is a hackable terminal that can be used to reactivate the nearby elevator which leads back to the surface. However, this will also activate two hostile Protectrons, which the terminal fails to disable when prompted to do so.

Notable loot

 * Power armor frame with random leveled power armor pieces attached, on the lowest level.
 * Two Vault-Tec lunchboxes - One behind the power armor frame in a small maintenance cart, and one on top of the main control center near the novice locked terminal (accessible by jumping down from the floor above).
 * U.S. Covert Operations Manual #4 - Next to a terminal (Novice) on the lowest floor towards the northern side (on the raised part of the floor, to the left).
 * Mini nuke - Under the stairs on the lowest floor, next to the power armor.
 * Stealth Boy - In the eastern corner room one floor down as one enters the surveillance center. It's located on a desk, behind a cardboard box, in the same room as the Eat'o'tronic.
 * Employee 011985TP personal log - Holotape, on the desk near the entrance.
 * Installation K-21B key and the evacuation plan note in Bill's suitcase within the abandoned shack.

Companion comments

 * When at this location, companions make comments, which are activated at the gantry overlook.

Appearances
The abandoned shack appears only in Fallout 4.

Behind the scenes

 * The abandoned shack and the surveillance center beneath may be a reference to the cottage seen in the opening scene of the 1983 film WarGames, which is located in a hostile environment and holds a secret missile launch facility beneath its floor.
 * The map that is on the wall of this facility is the same map that is shown on the globe objects in the rest of the Commonwealth; this map has two errors. First, it appears to be inconsistent with the Fallout Divergence, as the countries of the Soviet Union (such as Ukraine, Kazakhstan, etc) are shown to be independent, as is Canada separate from the United States. The second error is that the Black Sea, Baltic Sea, Caspian Sea, Great Lakes, Mediterranean Sea, Persian Gulf, Red Sea, and the northern half of the Gulf of California are colored as if they were landmasses, and not bodies of water.