Vault 88

Vault 88 is a Vault-Tec vault and potential settlement in the Commonwealth in 2287.

Background
The security system was installed in August 2077. The entrance was completed and Barstow was slated to arrive on October 22, 2077. The security lead wrote that she would have VIPs with her, and as long as they stayed in the entrance section, it would "feel like a real vault." The security lead commented that the construction team was pleasant, joining in their poker games, and was invited to their Halloween party.

Due to Vault-Tec construction mishaps, the vault was still under construction when the war happened. Accessed via a small cave beneath Quincy Quarries, the entrance to Vault 88 was buried in rubble as soon as the bombs fell during the Great War. On a letter dated 10/26/2077, Samantha Hatchett, HalluciGen, Inc. VP of Marketing sent Vault 88's overseer Dr. Valery Barstow, outlining a requested chemical formula and thanking her for allowing HalluciGen the opportunity.

Due to detecting a "nuclear detonation event," an automated security lockdown was initiated on October 23, 2077. A radio beacon broadcasts an emergency signal, stating that the authentication codeword is IMPISH and that there has been an "unspecified integrity breach." The broadcast continues, warning that any available Vault-Tec personnel are required to respond under "Emergency Protocol VT-76."

When the Sole Survivor approaches this vault for the first time, a group of raiders will be trying to force their way in - the event that triggered the emergency broadcast calling for help - and Overseer Barstow will inform the raiders that their efforts are futile.

Layout
Once the raiders are dealt with, the Sole Survivor can activate the control panel using their own Pip-Boy to open the vault door. When inside, the overseer will ask the Sole Survivor to find the Vault-Tec control board in the reactor room to reactivate the workshop and free her from behind a caved-in corridor.

More building space can be unlocked by finding other control boards, one for each sector of the vault. Once all of the sectors have been unlocked, the vault becomes a seamless and expansive workspace, with the only borders being at the vault's door itself, the subway exterior entrance, and the pharmacy exterior entrance.

Entrance
Vault 88 consists of a number of chambers and passageways. In the initial stage of the related quest line, the vault entrance and reactor room are accessible and occupied by a number of leveled feral ghouls, one being Security Chief Andersen.

Once the main area's workshop has been unlocked, the player character may then access the main cavern of the vault, which is an expansive space filled with construction machinery, destroyed trains, and piles of debris. All of these can be scrapped for open space. There are several feral ghouls in the area, as well as a glowing one. One of these feral ghouls is named Julian.

Huge debris piles and walls are in tunnels to the north and east of the main room. Each of these seals off one of the three remaining sectors of the vault (north, northeast, and east), and once scrapped in workshop mode, will initially reveal a border beyond which the workshop cannot yet access.

North Sector
Starting from the main chamber, the north tunnel passes a mole rat infestation to reach a ruined subway platform area where the north sector control board and several feral ghouls may be found. Through another cave tunnel farther along the platform is the north sector workshop. After activating the workshop, just to the east is a wall that may be scrapped to clear the way to a small cave occupied by a leveled legendary deathclaw. Another wall on the far side of this cave opens near the start of the north tunnel and the main chamber.

Throughout the north tunnel and deathclaw cave on the ground, walls, and ceiling are 11 uranium veins providing 61 nuclear material when scrapped, as well as several scrappable uranium barrels in the subway area. The subway platform also includes a wooden barricade at the end; when this is scrapped, access to the manhole entrance near Milton General Hospital will become available. An open tunnel northeast of the north sector workshop connects to the northeast sector and the nearby northeast sector workshop, with a wall blocking further passage to the left.

Northeast Sector
Starting from the main chamber, the northeast tunnel descends sets of metal stairs and continues past construction supplies and equipment through another area occupied by mole rats. Natural cave passages studded with more uranium veins eventually give way to an area built of brick and concrete hosting several feral ghouls and the northeast sector control board. Through a hole in the wall is another cave passage that soon descends a natural slope to the area with the northeast sector workshop. After activating the workshop, a wall on the northern side of the passage a short distance past the initial metal stairs may be cleared to reveal a nest of seven radscorpions. Another wall past the nest is the wall next to the northeast sector workshop described above.

Returning to the brick and concrete area, scrapping the wooden barricade up the stairs will free the feral ghouls beyond it and unlock the University Point Pharmacy entrance. Finally, a wall up a rock face directly east of the initial metal stairs connects to the flooded room with the east sector workshop, the Vault-Tec water pump, and a group of mirelurks.

East Sector
Starting from the main chamber, the east tunnel descends a subway tunnel to a small room at the end on the right with some feral ghouls and the east sector control board. Crossing the parallel tunnel to the north and continuing to descend to the east leads to the room with the east sector workshop. After activating the workshop, a hole in the southern wall of the control board room opens to a small natural cavern space with three uranium veins and a wall.

Beyond the wall are more uranium and another wall. Through the second wall is a large cavern with many uranium veins and radscorpions. Two more walls flank this large cave: the wall to the east hides several mole rats, and the wall to the west reveals a leveled sentry bot, while both areas feature more uranium.

Inhabitants

 * Overseer Barstow
 * Security Chief Andersen
 * Julian
 * Clem (after A Model Citizen)

Notable loot

 * Vault-Tec control board - Held by Security Chief Andersen in the reactor room.
 * Three other control boards - One for each sector that can be unlocked (east, north, and northeast). They're found in each of their own sectors.
 * A Vault 88 trunk - To the right of the entrance. Contains 10 Vault 88 jumpsuits and 10 Pip-Boys, with an eleventh jumpsuit on top of the trunk. The contents of the trunk are reset as soon as the Vault is exited.
 * Legend of Vault 88 - Given by Overseer Barstow after completing all of the experiments.

Appearances
Vault 88 appears in the Fallout 4 add-on Vault-Tec Workshop.