The Mechanist's Lair

The Mechanist's lair, formerly the United States of America Robotics Technology Facility RB-2851, is a location and potential settlement in The Commonwealth

Background
The Mechanist's lair is hidden underneath the RobCo Sales & Service Center, which primarily sold and maintained terminals. Employees of the service center were specifically instructed not to interact with any abnormal shipments, or else they would be taken for "extensive questioning by our friends downstairs." In the service center's basement, a large hidden door that requires a robot equipped with an M-SAT to open leads into a large underground pre-War facility that was used for the development and construction of Robobrains. The facility was operated jointly with General Atomics and the U.S. Army Robotics Division. Part of the facility functioned as a pseudo-prison, housing prisoners who were later operated upon to remove their brains. After being wiped of memories and subjected to assorted tests, the brains were housed in Robobrain heads and mounted on any of a number of devices, including the bodies of normal Robobrains.

At some point 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 threaten humans.

Layout
At the end of Restoring Order, direct access to the lair becomes available via a freight elevator inside a garage northwest of the East Boston Preparatory School. Upon completing the quest, the lair also becomes a new settlement.

Settlement information

 * Despite being another interior settlement, this settlement has significantly more customization options than Home Plate, but unlike Home Plate, has a settlement building limit.
 * The Mechanist's lair functions like an exterior settlement, in that settlers can be moved here, and supply lines can be established.
 * The following settlement crafting options are unavailable:
 * Food
 * Garden plot
 * Recruitment radio beacon
 * Scavenging station
 * Stores
 * There are two small patches of dirt where water pumps can be placed on the top level in the northernmost corner, just outside the entrance to the facilities wing.
 * The crafting stations found throughout the complex outside the construction area are linked to your workshop as if they are part of the settlement.

Inhabitants

 * The Mechanist
 * Sparks

Notable loot

 * Several robot parts models are scattered throughout the interior:
 * Eyebot model - Near the entrance, on top of some file cabinets in the small Advanced-locked room with a skeleton hanging out the window.
 * Mr. Handy model - In the quality control area, on the desk next to the chief engineer's terminal.
 * Robot parts model A - Just after power substation A, in a locker.
 * Mr. Gutsy model - In the research wing, behind the watch station terminal desk near the entrance.
 * Robot parts model B - In the research wing, on a shelf in the property storage room behind a Master-locked terminal.
 * Protectron model - In the research wing, on a surgical tray near the medical observation terminal in the observation area above the cells.
 * Robot parts model C - In the research wing, near the cerebral reconditioning terminal in the brain extraction area.
 * Five Nuka-Cola Quantums:
 * One is near the entrance, in a locker just past the initial security doors.
 * One is just outside the quality control area, on the ground near an Eat-o-tronic.
 * One is in the quality control area, on the ground near the chief engineer's terminal.
 * Two are in the facilities wing, in a crate on the ledge to the left by the descending ramp near the entrance, near a Jangles the Moon Monkey and a clapping cymbal monkey playing the video game "Pong" on a console.
 * Two Vault-Tec lunchboxes - One is in the production wing at the end of the robot storage area by a skeleton underneath a yellow eye protection poster. Another is in power substation B on a red stepladder behind the generators.
 * Fusion core - Near the entrance, in the generator to the left just before the decontamination/laser tripwire corridor.
 * Lead engineer's holotape - In the quality control area, on the desk next to the chief engineer's terminal.
 * Day Tripper - In the quality control area, near a desk with a skeleton on the upper level.
 * Perfectly preserved pie - In the assembly line room, in an Eat-o-tronic.
 * Facilities director's holotape - In the facilities wing, next to a Novice-locked ammo box by the facilities management terminal.
 * Forfeiture terminal password - In the research wing, behind the watch station terminal desk near the entrance. Unlocks the Master-locked property storage lockup terminal.
 * Stealth Boy - In the research wing, on a wooden box to the right of a hole in the floor at the end of the cell observation area.
 * Chief scientist's holotape - In the research wing, near the cerebral reconditioning terminal in the brain extraction area.
 * Medical terminal password - In the research wing, on a Quantum Robobrain near the incinerator in the robobrain assembly area. Unlocks the Master-locked robobrain production terminal.

Mechanist's headquarters

 * RB-2851 master control password - Given by the Mechanist during Restoring Order, or taken from her body. Unlocks the key-locked master control terminal.
 * Mechanist's armor and matching helmet - Obtained at the end of Restoring Order.
 * Protectron's Gaze - Carried by the Mechanist.
 * Fusion core - In the main room, on a small set of metal shelves under a ramp near a couple of radioactive barrels to the east.
 * Burnt technical manual - In the hallway outside the Mechanist's bedroom, on the small set of metal shelves. Only three others exist, and are found on Automatron NPCs.
 * Overdue book - In the hallway outside the Mechanist's bedroom, on the small set of metal shelves.
 * Mini nuke - In the room at the end of the hallway outside the Mechanist's bedroom, on the shelf.
 * Spotlight schematics - In the room at the end of the hallway outside the Mechanist's bedroom, on the large "Hubris" terminal console.
 * Eyebot pod schematics - In the Mechanist's bedroom, on the table near the entrance.
 * Mechanist's log - In the Mechanist's bedroom, on the table next to the bed.
 * Drawing of the Mechanist - In the Mechanist's bedroom, on the table next to the bed.
 * Sentry bot model - In the Mechanist's bedroom, on the table next to the bed.

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

Bugs

 * After completing Restoring Order, 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.
 * There is a chance 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 may drop dramatically when looking in the glitched direction. There is no known fix for this issue so far.
 * The locations of the player character and the player character's power armor may be marked incorrectly on the map when inside the Mechanist's lair. This is corrected upon leaving the building.