The Mechanist's Lair

The Mechanist's lair, formerly Robotics Technology Facility RB-2851, is a location and settlement that appears in the Fallout 4 add-on Automatron.

The lair is located on the map slightly north of the East Boston Preparatory School. It is behind a building that is unmarked, and near a warehouse that is by a bridge and a small wharf. A freight elevator inside the building (enter the door named "garage") will take the Sole Survivor directly to the underground location. Upon completion of the add-on, it is a new player character home.

Background
The Mechanist's lair was hidden underneath a RobCo sales and service center which primarily sold and maintained terminals. Employees of the service center were told specifically not to interact with any abnormal crates, or else they would be "taken to see our friends below." In a storage room for the center, a large door which requires an M-SAT to enter leads into a large underground facility that pre-War was used for the development & construction of robobrains (jointly run with General Atomics and the United States Army Robotics Division). Part of it functioned as a pseudo-prison which housed prisoners, who were later operated upon to remove their brains. After wiping their brain of memories and passing assorted tests, the brains would then be housed in a robobrain head and mounted to any of a number of devices, including the bodies of a normal robobrain, controlling stretchers or even controlling operations inside the control center.

Sometime before the events of Automatron, Isabel Cruz discovered the facility while scavenging and took it upon herself to use it to create an army of robots to save The Commonwealth from anything which may hazard humans.

Inhabitants

 * The Mechanist
 * Sparks

Appearances
The Mechanist's lair only appears in the Fallout 4 add-on Automatron.

Behind the scenes
The doors in the lair open in a similar pattern to the ones from the Robot repair center from Fallout 3. Although, unlike Fallout 3, the doors cannot be closed.

Bugs

 * After completing the final quest, leaving the building may cause the game to crash.
 * Fast traveling directly to another location, rather than leaving through one of the doors, may solve the issue.
 * Using the cargo elevator immediately behind the original spawn point may cause robot companions to disappear, sometimes permanently.
 * There is a chance for a saved game that the Mechanist's Lair cell may become graphically glitched when facing certain directions. Textures may pop in and disappear as you angle the camera and FPS drops dramatically when looking in that direction. There is unfortunately no known fix for this issue so far. The only way to circumvent this is by starting a New Game and hope for the best. Note that this issue does not make it impossible to finish the quest but makes it really tedious. (Tested on version: 1.5.157, Automatron and Far Harbor installed)