HalluciGen, Inc.

HalluciGen, Inc. is a location in the Esplanade neighborhood of Boston, still accessible in 2287.

Background
Before the Great War, HalluciGen, Incorporated was a biochemical manufacturer and innovator, aspiring to be the world leader in nonlethal technology for use by police and the military.

Recently, a contingent of Gunners came to the facility on the contract of a classified client to secure pre-War military technology, particularly the facility's "InvisiWave" and "Irradicator" weapons, as well as access to the facility's mainframe and to download any available schematics. However, when they accessed the lab, a hallucinogenic chemical was released, causing the Gunners who came in contact with it to enter a murderous frenzy from catastrophic adrenal gland rupture. Those that survived the initial wave died fleeing the location, shot in the back by their frenzied brethren.

Layout
When the Sole Survivor first encounters the facility, the building is a mess of collapsed floors. The building opens to a reception area; a hallway to the east contains a collapsed floor that leads down to the basement, which contains an employee locker room. A hole in the wall leads into the building's maintenance room before returning to the ground floor via another collapsed floor. The subsequent hallway leads to a research office (which contains a weapons workbench). The hallway to the west goes past a conference room, a security room (including some protectron pods), and into a break room with stairs leading to the second story. The first room out of these stairs is the accounting offices.

To access the third floor, the player character may need to walk into a wall painting blocking the doorway to the staircase, nudging it out of the way. Further, two inactive protectrons may block the way into the first room on the third floor, requiring their destruction.

At some point, one can ascend into a corridor with several doors, which are opened by buttons. There are Gunners fighting behind each of them. As an alternative to direct combat, the player character can jump to the balcony with a staircase. This leads upstairs to a room, which will greet the player character with an announcement and invite them to test some "products."

Pressing the various buttons in this room will emit poisonous gases to the rooms downstairs housing the Gunners. A terminal in this room reveals that the rooms below were actually used to demonstrate the products to VIPs, after which the rooms should be "cleared of test subjects, blood, fluids."

A staircase to the south leads down to the basement, where the mainframe is kept. The player can either hack the door terminal directly or utilize the mainframe terminal in the adjacent room. Beyond the maglocked door are the laboratories. To the south is a decontamination chamber filled with deadly hallucinatory gas, which can be removed by using the nearby terminal to start the contamination process. The chamber leads into the labs proper (otherwise blocked by an Expert-locked door), which contains three chemistry stations. A busted wall on the other side of the lab exits out to Boston.

Behind the building is an exterior room with a green Gun Shop sign, inside of which are a power armor station, a chemistry station, and a weapons workbench.

Ground level

 * Two Help wanted! notes – On the entrance reception desk.
 * Five drugged water cartons in the entrance room - One on the small table immediately to the right after entering the building from the main entrance, four more behind the reception desk.
 * Day Tripper - In the toilet tank after passing through locker/shower room.
 * Tesla Science Magazine – Entrance level, northeast corner of the building, after ascending via a collapsed section of roofing. This is the room with the research terminal controlling a HalluciGen Suppressor prototype device.
 * Note from Eric – On a desk beside the accounting terminal on the second level.
 * Two drugged water cartons in the testing chambers' locker room, down the hallway from the room with two Gunners locked in.

Basement

 * HalluciGen master password – Can be obtained from the mainframe access terminal, giving access to the lab access terminal, decontamination terminal, research terminal, and the CEO's terminal.
 * Nine HalluciGen gas canisters – All located in the same room as the Gunner commander. One unit is needed for the miscellaneous quest Hazardous Material given by Fred Allen in Goodneighbor, and only appears if that quest is active. This room is reachable from the interior by a terminal with an expert lock. Alternatively, the room can be accessed directly from the Commonwealth through a back door, north of the building, with a master lock, bypassing most combat and chemical exposure.
 * 14 ruptured HalluciGen gas canisters – All located in the same room as the Gunner commander.
 * Stealth Boy – In an open safe in the same room as the Gunner commander.
 * HalluciGen mission brief and Gunner's note – On the Gunner commander.
 * Nuka-Cola Quantum – In the same room as the Gunner commander.
 * HalluciGen key – In a steamer trunk near the north exit to Esplanade; another copy is on the Gunner commander.

Appearances
HalluciGen, Inc. appears only in Fallout 4.

Behind the scenes
Brent Spiner, best known for the role of Data in Star Trek, has stated on Twitter that he may have voiced the HalluciGen mainframe heard in the building. However, he is not credited for the role and has not given a fully definitive answer.

Bugs
The non-hostile Gunner may not go to the window to speak with the player character. Saving prior to the encounter, exiting and re-entering the building may solve this.

The fighting and gunfire between the gunners in the accounting terminal room may displace the Note from Eric, rendering it unobtainable. Reloading a save prior to entering the building may make it appear.