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Vault 101 Characters

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Vault 101 Experiment

Vault 101 is the player character's home. While it only takes a short while to play through at the start of the main storyline, it can be returned to later for an optional quest.

The Lone Wanderer's Family

James

The father of the player character. He was a good father for most of his life, but when his child turned 19, he left the vault, throwing the residence into chaos. The player searching for him and uncovering why James left is what drives the first part of the plot.

• Anti-Hero: He's one of the most noble characters in the DC Wasteland, but he's not without his flaws. (see Nice Job Breaking It, Hero!)
• Big Good: Could be considered this. His intention for Project Purity was not to gain power or influence, but simply to bring clean water to the Capital Wasteland, make the world a better place and fulfill his late wife's dream.
• Badass Baritone: Courtesy of Liam Neeson.
• Badass Beard: Through all the ages, Dad's got a short beard on him. He definitely proves the 'Badass' part during the game.
• Badass Bookworm: Not only is James a talented doctor, but he's certainly no slouch in the combat department, either.
• Beard of Sorrow: He is clean-shaved at the very start of the game (when Catherine dies in childbirth) and during the scene where the Lone Wanderer is a toddler, then has a short beard during the next sequence (set when the Lone Wanderer is 10) that he keeps for the rest of the game. Dialog options after his rescue from Vault 112 show he still misses her almost twenty years later.
• The Charmer: Various characters mention he's got quite the silver-tongue.
• Daddy Had a Good Reason for Abandoning You: He really, really does.
• Deadly Doctor: He's actually pretty proficient in combat, even if he wasn't invincible due to him being marked as 'essential'.
• Disappeared Dad: His sudden disappearance from Vault 101 is what kickstarts the plot.
• Disappointed in You: His reaction towards the Lone Wanderer if s/he nukes Megaton, as it goes against everything he taught his child.
• Determinator: When it comes to making Project Purity a reality.
• Determined Expression: According to Three Dog, he has the exact same 'I can get shit done' look in his eye as his son/daughter.
• Give Him a Normal Life: He headed off to Vault 101 and abandoned Project Purity so his son/daughter could have the best life he could provide with the Vault's resources.
• Good Parents: Although not without his flaws.
• Guile Hero: Speaking with people who've dealt with him in the past, such as Moriarty and Dr. Li, reveals that James is extremely charismatic and has a way with words; he was able to convince Moriarty to help him despite the bar owner's normally selfish nature, was able to talk his way into Vault 101 despite the Overseer's extreme isolationism and xenophobia, and was able to convince the Brotherhood to help defend Project Purity despite their doubts over its success or utility. He's quite similar to a Speech-based player-character.
• Heroic Sacrifice: He floods the Project Purity chamber with radiation, killing himself and a couple of Enclave soldiers, to keep them from taking Project Purity and allow his child to escape.
• Horrible Judge of Character: It's implied that while the Overseer made no secret of his hatred for James and his child, James believed that he simply wasn't twisted enough to let it get the better of him. Unfortunately, he was wrong and without James around to provide his service as their Doctor, the Overseer had no reason to keep you around either.
• Magnetic Hero/The Social Expert: Not only did he convince the Overseer to let him into Vault 101, xenophobia be damned (although the need for a doctor did greatly grease the skids of the decision), he actually managed to get Moriarty to put his jerkass ways on park around him.
• Mysterious Past: His past prior to starting Project Purity is deliberately vague, but other characters suggest that he wasn't even from Rivet City. A (possibly non-canonical) photograph showing a young version of him and Catherine found in Vault 21 in New Vegas suggests he somehow migrated from the Mojave Wasteland to the Capital Wasteland. Considering that Harold, the Brotherhood, the Enclave, and Conrad Kellogg all did as well, it's not impossible James did too.
• Nice Job Breaking It, Hero!: Another trait of his. He means well, but he often miscalculates how much trouble his actions stir up. Best shown at the beginning when his disappearance from the vault causes anarchy to break out and forces his child to flee for his/her life, the irony being that James left you behind in the first place because he thought you would be safe there.
• Nice Guy: Even Colin Moriarty doesn't have a single bad thing to say about him, in a terminal filled with various bits of dirt and blackmail material he has on people.
• One Steve Limit: Averted. He shares his name with James Hargrave, a child living in Rivet City.
• Papa Wolf: Threaten his child, and he'll proceed to show you just why one should always Beware the Nice Ones. Funnily enough, this was actually a couple of years before Liam Neeson's most famous Papa Wolf role.
• Playful Hacker/Gentleman Thief: In a holotape, he admits that he would often sneak into the restricted sections of the Vault 101 at night to see if any of the advanced pre-War technology could have helped with Project Purity. Coming up with nothing, he decided to break into the Overseer's office and hack his terminal (whilst a little drunk on scotch), whereupon he learned about the GECK.
• Science Hero: To the extent that the Perk that increases the Lone Wanderer's Medicine and Science stat is titled 'Daddy's Boy/Girl'.
• Unexplained Accent: His Irish accent is never explained. Maybe that's why Moriarty likes him?
• What the Hell, Hero?: If you nuke Megaton, he won't hesitate to let you know how he feels about it.
• What Were You Thinking?: The Lone Wanderer can give James a hefty heaping of this after they reconnect.

Catherine

The Lone Wanderer's mother, who dies shortly after childbirth in game's first cutscene. It's implied that she was the emotional driving force behind Project Purity and remains so for James long after her death.

• Black and Nerdy: Console commands and her photograph in Fallout: New Vegas show that she's black, and she's also a brilliant scientist.
• Black Dude Dies First: Her death kickstarts the game via the next trope.
• Death by Childbirth: She dies giving birth to the player character.
• The Lost Lenore: After almost 20 years, James still mourns her.
• Meaningful Name: 'Catherine' means 'Pure'
• Mysterious Past: Like her husband James, we don't know anything about her life before Project Purity and her death.
• Plot-Triggering Death: Her death is what causes James to lose faith in Project Purity, which in turn makes him move into Vault 101 with their child.
• Posthumous Character: She's long dead by the time the game gets going.
• Small Role, Big Impact: She dies first thing in the game and is only mentioned by a few characters, but her actions drive James to leave the Vault, triggering the events of the game.
• The Voice: Unless you go digging in game files or find a Easter Egg picture while playing New Vegas, her face is never shown.

The Overseer's Family

Overseer Alphonse Almodovar

The ruler of Vault 101. Afraid of losing control, he exercises complete control over everyone in the vault, and enforces the rule that 'no one ever enters and no one ever leaves.' His only soft spot is his daughter, Amata. When your father leaves he takes a turn to the extreme to keep anyone else from leaving, causing disaster in the Vault.

• 0% Approval Rating: While his approval was never high to begin with, he fully crosses this in the aftermath of your escape, causing the residents to begin to riot and form into factions.
• Establishing Character Moment: He first appears at your birthday party, where he acts overly stiff and official, presents you a Pip-Boy with a reminder you'll get your first work assignment tomorrow, says Amata likes you 'for some reason,' and when asked why he didn't help plan the party he says he gave Amata 'all the appropriate paternal encouragement' but did not compromise his judgement as Overseer due to his daughter's involvement. If you follow him when he leaves the party, you find him telling a security guard he only attended the party because his daughter is your friend, refers to you as 'that little brat', and then he tells the guard to break up the party and get the group back to work after another few minutes. This all sets him up as a joyless, no-nonsense authority figure who doesn't like you, places his duties as Overseer above his relationship with his daughter, and is much less nice and reasonable than he acts around the citizens.
• Even Evil Has Loved Ones: Reading the computer in his office shows that he cares about his daughter (and regrets her coldness toward him). Another file in his computer reveals while he uses the Tunnel Snakes as his own militia, he is definitively not cool with them bullying Amata, and intends to call out Butch on the subject for their next meeting.
• Everyone Calls Him 'Barkeep': Most of the time he's only referred to as 'the Overseer' (even by the game itself). Subverted, as Stanley Armstrong does have an offhanded comment where he refers to Alphonse by his first name.
• Fantastic Racism: His irrational hatred for James and the Lone Wanderer becomes understandable in retrospect, as you're both Wastelanders. He presumably considers your presence to be infecting the purity of the Vault.
• Green-Eyed Monster: Another reason implied for his dislike of James is due to his popularity amongst the residents of Vault 101, who are supposed to be showing that sort of respect and admiration towards him as Overseer. Instead, nearly everyone expresses openly about how they don't care for him at all.
• Kick the Dog:
  • He has Jonas murdered because he suspected him of cooperating with Dad in his escape, and will straight up try to execute you if you surrender to him.
  • Accessing his terminal while escaping from the Vault reveals he's not only allowed Butch and the Tunnel Snakes to run around, but he's had them perform 'services' that for some reason his security team can't — the implied 'services' are harassing Vault residents who act out of line.
  • If you pause to spy on him and Officer Mack interrogating Amata while escaping the Vault, he not only lets Mack physically intimidate Amata and threaten her with his baton, but prompts him to do it when his efforts to talk to Amata fall short.
• Jerkass: The first time you meet him in person, he gives you a condescending speech about responsibility at your birthday party, insists that you thank his daughter for putting it together and reacts angrily no matter how you respond, then leaves early and tells security to break it up shortly after.
• Jerkass Has a Point: Though he's cruel and arrogant, he's not wrong about everything. His strict rules about keeping the Vault sealed are cast into a new light when you read his computer terminal during 'Trouble on the Homefront' revealing that The Enclave knows about the Vault and wanted access, but he refused them entrance because he didn't trust them. Given how Three Dog talks about your exploits and you and your father being from Vault 101, the two of you are to blame for literally broadcasting to the Wasteland 'hey, there's a fully active Vault here with people living in it.'
• Papa Wolf: He is fiercely protective of Amata. James' medical notes reveal that he is present during all of his daughters check-ups in order to make sure his daughter hasn't gotten pregnant. If the Lone Wanderer is a male, this definitely adds a whole other level of subtext to why he has developed such a fierce hatred of you.
• The Password Is Always 'Swordfish': The password to his terminal is Amata. Not only that, but he keeps a paper with his password on it in the same room as the terminal.
• Pet the Dog: He does genuinely care for his daughter, Amata.
  • During 'Escape!', you can threaten her and he'll back off immediately. During 'Trouble On The Homefront' you can tell him about the unauthorized raid on the rebels, which would involve lethal force and could result in Amata being hurt or killed. After a very brief My God, What Have I Done? moment, he'll put an end to the conflict right then and there.
  • During the same quest, you can find out that the Enclave requested access to the Vault, but he refused as it posed unknown risks to the Vault and its citizens.
• Ungrateful Bastard: Even if you come back and complete 'Trouble On The Homefront' in his favor. He does give you a reward... and then basically tells you to get the hell out and never come back.
• Well-Intentioned Extremist: He really does think that he's acting in the best interests of the Vault. You can convince him to stop by convincing him that he's only making things worse for the Vault by his actions, such as pointing out that with all the deaths of Vault residents since your escape, there simply aren't enough people to keep a viable population anymore. Turns out he was aware of this, reluctantly admitting that without people from outside the Vault to provide an influx of new genetic material, they'll likely die off from inbreeding within another generation or two.
• What the Hell, Hero?: In 'Trouble On The Homefront' he calls you out on leaving the vault when James clearly wanted you to stay there where it's safe. While this is a valid point it seems he didn't think Jonas getting killed, the guards opening fire on you, and the next example may've had something to do with it.
• You Have Out Lived Your Usefulness: When you're escaping from the vault, you need to get his password to open the door. In this conversation with him, you have the option of surrendering, and giving him your gun. He then tries to kill you. With the same gun.

Amata Almodovar

The daughter of the Overseer and the Lone Wanderer's childhood friend. She helps them escape after James goes missing and the Overseer wants answers, and in their absence becomes leader of a dissident faction of residents that want to explore the idea of opening the Vault to outside interactions.

• Childhood Friend Romance: If male, it's strongly implied that Amata and the Lone Wanderer might have a crush on each other. Though depending on your actions that can easily be stopped.
• Foreshadowing: If you kill her father during your escape from Vault 101, upon meeting up with her she tells you she hopes that you never have to know what it feels like to see your own father die right in front of you.
• Incompatible Orientation: If you're female and hit on her she gets grossed out.
• Klingon Promotion: Can be one way of solving the quest Trouble On The Homefront, kill the overseer and promote her to leader.
• The Password Is Always 'Swordfish': Presumably, her father changed the password after you left, but when she contacts you to return she says the password is her name, again.
• What the Hell, Hero?: If you kill her father during the escape, she will confront you about it. Of course, this is an entirely justified reaction: how would you react if your best friend killed your father?
• You Can't Go Home Again: The best outcome for Vault 101's divisions in 'Trouble On The Homefront' is to convince the Overseer to step down and let his daughter succeed him. Though it pains her to do so, Amata says you the most important task is now to heal the rifts between the Vault dwellers, and your continued presence would be too divisive. She hopes you can return some day, even if the quest log tells you to 'Leave Vault 101 forever'.
  • A later random encounter has the Lone Wanderer encounter Susie Mack outside the Vault reinforces this. Despite Vault 101 becoming stable once more and even beginning to trade with the outside world, you cannot return as your presence would cause too much strife and dredge up too many bad memories. She also mentions that Amata obviously misses you.
  • Justified, if you chose to sabotage the vault. This triggers a random encounter with the Enclave interrogating her about the location of Vault 101. If you simply watch and listen they will kill her, but if you save her life and talk to her, she will simply tell you this is all your fault... and she's not wrong.

Mack Family

Allen Mack

The father of Wally, Stevie and Susie Mack and eventual Overseer of Vault 101 if the current Overseer dies. He is a very angry and hostile individual and blames The Lone Wanderer for the vault almost falling apart in the chaos caused by a Radroach outbreak and their father leaving.

• From Nobody to Nightmare: If the player kills the Overseer during their escape from the vault he'll become the new, even more tyrannical Overseer in his place. Unlike the previous leader he won't even try to be reasonable when The Lone Wanderer returns home and will most likely try to kill them at the first opportunity.
• Jerkass: His defining characteristic. It seems like his children inherited this trait from him.
  • Jerkass Has a Point: As bad as he is his actions become a lot more justified if the player killed both the previous Overseer and his son Stevie, which gives him a legitimate reason to hate the Lone Wanderer's guts.
• Viler New Villain: If you killed the original Overseer during your escape in the beginning of the game, he replaces him as the Overseer and is even more selfish and corrupt. Also, if he's in charge during Trouble on the Homefront, the only way to solve the quest in Amata's favor is to kill him, while doing the same quest on Amata's side with her father still in charge allows to pacifically convince him to resign.
• Never My Fault: He blames the player and their father for everything bad that happens in the vault even after he becomes Overseer and has direct control and responsibility over it.
• Tyrant Takes the Helm: While the original Overseer was no saint he at least managed to keep things fairly orderly and peaceful. Mack on the other hand seems to only care about his personal power and will happily attempt to gun down the Lone Wanderer if they try to reason with him.

Officer Steve 'Stevie' Mack

One of the security guards working for the Overseer. He is a very violent and sadistic man and is the one who killed Jonas after The Lone Wanderer's father left the vault.

• Bald of Evil: He has about as many good deeds to his name as he has long hairs on his head.
• The Dragon: To the Overseer.
• Jerkass: Just like his father this guy is a grade A asshole.
• Like Father, Like Son: It's clear where Stevie gets his bad attitude and violent behavior from.
• No-Holds-Barred Beatdown: He beats Jonas to death in retaliation for James leaving the vault.
• Police Brutality: He has absolutely no problem beating residents to death during an interrogation or following questionable orders from his boss.

Wally Mack

Vault 101 Costume

Another member of Butch's gang who goes out of his way to be a jerk towards The Lone Wanderer, even at their own birthday party!

• Back for the Dead: He and the Tunnel Snakes reappear in the Fallout 4 Creation Club quest 'Tunnel Snakes Rule!'... where he's accidentally turned himself and his underlings into feral ghouls that you have to put down.
• Greaser Delinquents: He's a member of the Tunnel Snakes after all.
• Jerkass: Though less antagonistic than his father and brother he is still rude and condescending to the player and taunts them about not being as cool or fun as him.
• Like Father, Like Son: Though he's nowhere near as bad as Stevie at least.
• Too Dumb to Live: In his Fallout 4 DLC appearance, he's been turned into a glowing one. How? He and the newly reformed Tunnel Snakes built their base next to a stockpile of radioactive waste, believing that it would give them superpowers.
• Two Voices, One Character: He goes from Jeff Baker as a teenager to Craig Sechler - who also voices Butch - as an adult. Given the significant differences in their voices, it's possible he was Other Darrin'd in the middle of production
• Saved by Canon: His reappearance in Fallout 4's Creation Club DLC confirms that the Lone Wanderer didn't kill him or side with the Overseer. It doesn't last long.

Susie Mack

Allen's daughter and Wally's sister. She initially doesn't have much of a personality but undergoes some important character development if the Lone Wanderer completes the 'Trouble On The Homefront' mission.

• Action Girl: Depending on how the player finishes 'Trouble On The Homefront' she can later be encountered outside of the vault, scouting the wasteland with a gun and vault armor.
• Jerkass: Though she'll become a lot nicer if the Lone Wanderer comes back to help Vault 101 later on in the game.
• Took a Level in Kindness: She starts off not much better than her brothers and father, but becomes a lot friendlier when she meets the Lone Wanderer outside the vault.
• Two Voices, One Character: She goes from Jan Johns as a teen to Karen Carbone as an adult.

Other Vault 101 Residents

Jonas Palmer

A friend and colleague of the player's father, he helps James with his secret research on Project Purity. When James leaves the Vault, Jonas is interrogated and killed by an overzealous security guard.

• Black and Nerdy: He's the resident medical technician, as well as James' assistant.
• Black Dude Dies First: While he is far from the first person to be killed in the Capital Wasteland, he is the first character to die in game other then the player's mom (who is also black), who passed away soon after giving birth.
• Intergenerational Friendship: With the Lone Wanderer.
• Like Father, Like Son: The Overseer's terminal mentions that his mother Anne Palmer was part of the Scouting Expedition to Megaton in 2241. Jonas similarly conspired to leave the Vault to restart Project Purity with James, only to be killed by Officer Mack during the attempt.
• Nice Guy: One of the nicest people in Vault 101.
• Reasonable Authority Figure: One of the scant few in Vault 101. Ironically, the Overseer chose him to become James' assistant precisely because of this, hoping that Jonas would serve as a voice of reason and curb his more 'dangerous' ideas.
• Sacrificial Lamb: His death is a warning to Amata (and you) that the Overseer is not playing around.
• Secret Keeper: James had confided in him about Project Purity and he was a conspirator in the escape attempt.
• Undying Loyalty: Towards James. Sadly, this was the reason the Overseer had him murdered.

Andy

A Mister Handy robot that serves Vault 101. He is very bad at his job, unless that job requires needless violence.

• Comically Inept Healing: He is the absolute last person who should have ever been assigned to work as a doctor. His reaction to a simple sprained toe? Amputate the foot. The WRONG foot.
• Minor Injury Overreaction: See above.
• Robot Maid: He's a Mister Handy unit programmed to do a wide variety of menial tasks for his owners... like surgery, unfortunately.
• Ultimate Job Security: He's proven to only be good at killing radroaches and is incompetent at even mundane tasks like cutting a birthday cake or treating a sprained toe. Despite this, he still manages to find work when literally anyone else would be a far better option.

Edwin Brotch

Known as Mr. Brotch to his students. He overseers the infamous G.O.A.T. test that the Lone Wanderer takes during their high school years. He is known for being strict and hard to please, but is a decent guy underneath it all.

• Action Survivor: He's just a normal school teacher, yet manages to survive both the radroach infestation and the vault civil war that comes after it.
• Actually Pretty Funny: After the G.O.A.T. is completed, Wally Mack will remark that he 'figured out' the test and knew what answers to give in order to get his desired career. Hearing this, Brotch mutters 'Well I'll be damned, that little so and so, wish I'd thought of that when I was sixteen.'
• Deadpan Snarker: He clearly feels dissatisfied with his job and isn't above making the occasional snarky comment to his students. (Butch in particular.)
• Stern Teacher: He has a reputation for being a tough and strict teacher, but he knows that the whole G.O.A.T. test is a load of garbage and will even offer to adjust the Lone Wanderer's answers so that they come out however they want.

Officer Herman Gomez

The father of Freddie Gomez and a member of the vault 101 security team. Unlike his son he is a much more friendly and reasonable person and will sympathize with the Lone Wanderer when he encounters them during 'Escape!'

• Reasonable Authority Figure: He's one of the few people who realizes that James must have had a good reason for leaving the vault so suddenly and that taking his disappearance out on his friends and family isn't a good idea. Unless the player attacks him first he'll let them pass by unharmed and even wish them luck in finding their dad.
• Token Good Teammate: He is the only vault security officer who doesn't want to cap the Lone Wanderer on sight and wishes him luck in finding his father. He's also the only guard who nicely welcomes the Lone Wanderer when they come back during 'Trouble on the Homefront'.

Vault 101: Trouble on the homefront

Received from: automatically during exploration of Capitol Wasteland, but only if you're a few miles away from Vault 101 [Capitol Wasteland]

Solution: The important thing for you to know about is that you'll only be allowed to participate in this assignment after leaving the Citadel (once you've completed Waters of life quest).

Head over to the area where you've started the game (for example - to Megaton). Once you've arrived you should notice that your Pip-Boy has caught an emergency transmission. Open the Pip-Boy and choose radio from the menu. You'll notice that Vault 101's emergency frequency (screen) has been added to the list. Click on it and listen to a transmission from Amata. It would be wise to comply to her request and to return to your place of birth as soon as possible. Choose Vault 101 from your personal map to fast travel to that location. Enter the vault and approach the control panel to open it. Kill a radroach and proceed to a door located in front of the entrance.

You'll be stopped by an officer (Armstrong or Gomez) in the next room. You can ask him to guide you to certain areas of interest. You'll find out that rebels are raising against the Overseer. If you want to end this quest quickly, you can also ask the officer to keep your appearance a secret. You would then have to leave Vault 101 without anyone else knowing that you've visited this place. Obviously I wouldn't recommend ignoring this quest, because you won't receive any bonuses for exiting the vault and leaving its inhabitants with their problems. You can also make a similar decision later on - after talking to the Overseer or Amata. You don't have to ask the guard to guide you anywhere, because you're not far from your objectives and you should still remember the layout of the vault from the tutorial section of the game. Find a door leading to Vault 101 - atrium. Once you're there, ignore other guard firing at a citizen and turn left. Use the stairs to get to the upper balcony. Start moving towards Overseer's office. Be careful, though. Officer Wilkins will attack you in the server room and you must get rid of him (screen) before moving on. Check his body and you'll find a password to a prison cell.

You should consider visiting cells on your way to Overseer's office. This is the area where Amata was interrogated during the tutorial section. Notice that Mr Brotch is being held against his will. Use the newly obtained password to free him. Otherwise you would have to hack into the terminal or use a bobby pin directly on his cell. Rescuing Brotch won't interfere with the possible endings of this quest. Instead you'll find out that some of the guards are planning to deal with the rebels using brute force. Go back to a nearby security terminal and click on a TOP SECRET message (screen). Open your Pip-Boy and read plans of the raid.

Meeting the Overseer:

There are two opposing sides of this conflict - the Overseer and the rebels led by Amata. The Overseer can be found in his quarters. You've been there before, so you shouldn't have any major problems navigating your way through tight corridors. The easiest solution to the problem is to kill him, so the rebels will automatically seize control over Vault 101. After that you would have to inform Amata that you killed her father (or another Overseer - if her father is already dead). She wouldn't be pleased with the outcome and you would also lose a lot of karma points. The best possible solution is to convince the Overseer that he should agree to what the rebels are planning to do and to step down from command. There are two ways for you to achieve this goal - you can be very persuasive or you can inform the Overseer about what the raid planned by some of the guards (screen). Go to rebels base to share good news.

Meeting the rebels:

In order to get to Amata and other rebels you would have to choose one of a few available passageways leading to Vault 101 - lower level. Explore the northern area of the map and eventually you'll find a corridor leading to their outpost. You're going to be stopped by Butch along the way, however you may ignore him entirely if you want to. Amata can be found in the clinic, near your father's office. Your choices are to convince Amata and her friends to stay inside Vault 101 (screen) or to oppose to Overseer's wish and leave the vault or sign treaties with nearby settlements. It's much easier to suggest Amata that she should stay put if you've managed to hack into Overseer's terminal and if you've read messages he received from the Enclave.

Ending the quest:

It doesn't really matter which side you'll decide to help, because either the Overseer or Amata will banish you from Vault 101, even if you manage to find a positive solution. If you agree to help either side you will receive a reward - a modified utility jumpsuit. You may leave Vault 101 and once you've stepped through the door leading to Capitol Wasteland you'll also complete this quest.

Alternative solution:

If you plan on choosing the worst possible ending you can obviously start killing all the inhabitants, but there's also an easier way to make them leave Vault 101. Proceed to Vault 101 - lower levels, but ignore rebel's outpost. Instead locate the stairs leading to the lower floor and eventually you'll find an entrance to the reactor chamber. Explore your surroundings. You must get to a large console (screen). You've got two choices here - you can access the system with a key stolen from Stanley or you can become a hacker and break into the computer system. Once you've gained access to the main computer activate the water chip, switch to manual control and initiate cleaning procedure.

The consequence of your doings is that Vault 101 has been put into critical status and all the inhabitants are forced do evacuate it. Obviously you'll lose a lot of karma points by doing this. You may start moving towards the exit. Soon you'll encounter the Overseer. You can convince him that someone else has sabotaged the vault (screen) or you can confirm that it was you who damaged the reactor. If you're straight with him he'll attack you once the conversation is over. Amata will be waiting for you near the main exit. You can also lie to her, but she won't attack you even if you tell her the truth. Make sure that you're the last person to leave Vault 101.