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There's supposed to be a vault somewhere out here... a place called Vault 95. I've heard that Vault-Tec used it for some kinda social experiment... stuck a bunch of junkies inside to poke and prod. Well, they supposedly had some special method to clean up those blokes in there... some kind of a machine or somethin'. If we could get inside, maybe that machine could help me.Cait

Benign Intervention is a companion quest for Cait in Fallout 4.

Quick walkthrough

Companion Quest: Benign Intervention
Gain Cait's approval.
Bring Cait to Vault 95.
Locate the clean room.
Speak to Cait.
Wait for Cait to get in the clean room chair.
Use the terminal to cure Cait's addiction.
Speak to Cait.
Reward: 200 XP
Cait is cured of her addiction.

Detailed walkthrough

Once Cait trusts the Sole Survivor enough (requires 750 affinity), she will tell them about her history and current struggles with addiction. She will then suggest going to Vault 95 to seek treatment since her addiction has progressed to the point that standard treatments will no longer work. Vault 95 is to the west and just slightly north of Somerville Place.

The Gunners have claimed the vault, so the Sole Survivor will need to fight their way in. The room on the right after leaving the elevator (locked with an Advanced lock) has a terminal that can be used to deactivate some turrets ahead. Additionally, there are traps throughout the vault. Ahead is a large room with several enemies, and a Master level terminal blocks the door to the south that leads to the detox chamber.

Alternatively, in the overseer's office on the upper west side, there is an unlocked terminal that can open the door. Once passing through the door, several Gunners are found in the cafeteria. Go upstairs and around to the terminal to unlock the waiting area before the cleanroom. Inside the side room are a Gunner commander, a turret, and an active bottlecap mine on the desk.

Before entering the detox chamber, talk to Cait, who has misgivings about the process. There will be three Easy persuasion options, all of which give the same result. Once she gets into the extractor chair, activate the terminal and watch the chair work. Speak with Cait again once it is done and the quest will end.

Quest stages

Quest stages
StageStatusDescriptionLog Entry
10 Bring Cait to Vault 95Cait has confided in me that her dependence on Psycho is taking its toll on her health. I need to bring her to Vault 95 to cure her addiction before it's too late.
20 Locate the Clean RoomI've arrived at Vault 95 with Cait. I'm hoping the facility contains whatever it is we need to cure her addiction to Psycho.
70 Speak to Cait
80 Wait for Cait to get in the Clean Room Chair
90 Cure Cait's AddictionInside Vault 95, Cait and I have located the "Clean Room," an area dedicated to drug rehabilitation. After a short discussion, Cait has agreed to allow the Psycho to be purged from her body.
110 Speak to Cait
255Quest finishedQuest completeCait's addiction to Psycho has been cured by a device contained within Vault 95.
355Quest failedQuest failed


  • Before completing this quest, Cait will approve of chem use and most dialogue options in support of chem use (e.g. when giving chems to Mama Murphy). She will disapprove of those activities and statements once the quest is completed. Even as she notes her resentment of her addiction in the dialogue that triggers this quest, her stance on chem use will not change until the toxin purge is carried out and the quest is completed.
  • The big guns bobblehead is off to the right after the initial firefight location. It is at the far end of the residential section of the vault, in the northernmost room.
  • Without completing this quest, the maximum level of affinity that can be reached with Cait is 999. This means that to be able to get her perk Trigger Rush, one has to complete this quest first.
  • It is possible to do much of the quest without Cait as the active companion. The first objective will be completed upon arrival at Vault 95. Upon entering the cleanroom, Cait will begin walking from her assigned location to the cleanroom, but the following objective will not be completed until she arrives, which could take quite a long time.
  • After this quest, if chems are put into her inventory, she will not use them anymore unless a bug occurs where she still uses chems even though she has been cured from her addiction.


  • PCPC Playstation 4Playstation 4 Xbox OneXbox One The quest might not trigger after Cait's dialogue. If that happens, one can work around this by not allowing her to talk about it (choose the "Maybe Later" option). At this point, she will need to leave the player character's party but can't be dismissed directly without triggering the dialogue. Find another companion and ask them to join. Send Cait on her way, and as she is leaving, talk to her. This will trigger the dialogue again and this time, the quest will show up in the quest log.[verified]
    • PCPC To trigger Cait's quest after the bugged conversation, one can also:
      1. Get rid of any companion (do this by talking to them and choosing the appropriate dialogue branch),
      2. Stand in front of Cait,
      3. Open console and execute setstage 1666c5 0.
      4. The player character will be teleported to a location near Vault 95 and "Benign Intervention" quest will immediately be triggered to start, so one can see it in their quest log.
      5. Talk to Cait and add her to the player character's party,
      6. From this point you can be sure that if you follow all other advises in this section you will not encounter any bugs during the "Benign Intervention" quest.
  • PCPC To complete the "Find the Clean Room" objective, one will need to physically pass through the door leading to the Gunner commander. One may need to walk out and then back in if using V.A.T.S. or a perk like Blitz to enter the room rather than by walking through the door.[verified]
  • PCPC Playstation 4Playstation 4 The elevator tends to get stuck upon entering it and activating the button. To fix this, simply restart the game.[verified]
  • PCPC Xbox OneXbox One If Cait is wearing power armor when opening the door and entering the waiting room outside the Clean Room, it will disappear and not be recoverable after the procedure is finished. Have her get out of the suit outside of that area before proceeding.[verified]
  • PCPC If starting the quest while already in Vault 95 via normal means, it will become bugged to where returning to the entrance does not go beyond the first stage.[verified]