The Vault - Fallout Wiki

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The Vault - Fallout Wiki
Courier sides with NCR, supporting the republic
Quest data
LocationHoover Dam
Given ByGeneral Lee Oliver
RewardEnd Game
Xbox Live gamerscoreIcon gamerscore.png15PlayStation 3 trophyIcon ps3trophy.pngBronze
Editor ID?
Base ID00133075
Related quests
You'll Know It When It Happens
leads to:

Go kill those bastards.

General Lee Oliver

Eureka! is the final main quest in Fallout: New Vegas, if the players choose to side with the NCR. It is also an achievement/trophy.


The Second Battle of Hoover Dam is erupting as Caesar's Legion storms the dam and attempts to snatch it from New California Republic control. The Courier fights alongside NCR forces to make it to the Legion's base of operations and either kill Legate Lanius or force the Legate to surrender.


  1. Get briefed by General Oliver.
  2. (Optional) Speak to Mike Lawson and flush the Legion invaders through the turbines. Passing a Science check of 65 allows the Courier to use the terminal on the second floor of Power Plant 03 will engage the dam's turbine and cut off the Legion's approach into Hoover Dam.
  3. Make your way through the power plant and across the dam.
  4. Arrive at the Legate's camp across the bridge and deal with Legate Lanius.
    1. Kill him through conventional means
    2. Alternatively, make a series of speech checks that requires 100 in either Speech or Barter to convince him to leave. If one fails the last Speech check, one can still pass a Speech check of 85 to fight him one-on-one.
    3. Alternatively, make an easier set of Speech checks (of 60, 75, 90, and 90) and bluff him out by choosing the <lie> option after the last Speech check and causing him to flee.
  5. Once having dealt with the Legate, speak with General Oliver.

Quest stages

1 The Legion is attacking Hoover Dam, the Legate's camp must be destroyed to protect the dam.
2 (Optional) Mike Lawson suggested flushing the Legionnaires through the turbines to stop their invasion of the station.
3Quest finishedThe dam overflow has been diverted into the turbines, the Legionnaires can no longer use them to access the power plant.


  • If you lost your companions during your travels, they will be transported back to you for the battle.
  • If you have enlisted the help of the Boomers and recovered the B-29 from Lake Mead, the bomber will be seen flying from the south over the Dam when you come out of the turbine building, and will bomb the area in front of you. It will then fly off to the north towards Nellis.
  • Likewise, if you have convinced the Boomers to assist you and the NCR, Boomer howitzers at Nellis will provide fire support.
  • If you have completed For Auld Lang Syne, the Vertibird will appear after leaving the Hoover Dam checkpoint and the members of the Remnants who agreed to help will assist you with the battle on foot. If you convinced them to assist the Legion, however, they will be hostile. This has since been fixed by the latest patch.
  • If you have convinced the Great Khans to aid the NCR, they will be outside helping the NCR. One will approach you stating that they came just in time.
  • When exiting the visitor center, the engineer who intended to kill President Kimball may still be outside in which case he will take out his knife and rush to attack the Legion. You can search his body for the failsafe detonator.

Behind the scenes

"Eureka" is the state motto of California. The word comes from the ancient Greek word, heúrēka, meaning "I found it". There is a story of the famous Greek mathematician Archimedes, who shouted "Eureka!" upon making a great discovery and ran naked through the streets of Syracuse.


  • PCIcon pc.png PlayStation 3Icon ps3.png Xbox 360Icon xbox360.png Occasionally, leaving Power Plant 1 without completing the optional quest marker, you will randomly fail 'Don't Tread on the Bear!' and all NCR forces will become hostile to you.
  • PlayStation 3Icon ps3.png Xbox 360Icon xbox360.png Even after you kill Lanius, the quest marker will remain on him until all of Caesar's Legion in the area are dead. This can sometimes break the quest as the legion in the area are effectively stored in an unreachable area to the left of the main building were you encounter Lanius. This can be fixed via explosives such as rockets to kill them via blast radius.
  • PlayStation 3Icon ps3.png Xbox 360Icon xbox360.png It is possible for the player to fast travel when this quest is in progress by simply going through the Hoover Dam checkpoint and straight after you come out quickly go to your Pip-Boy and fast travel. After doing this you will have to use that same method if you want to fast travel again.
  • PlayStation 3Icon ps3.png The Legate has been known to flee once the two NCR Rangers appear, he will go out of the main gate, and you cannot follow him as the gate cannot be interacted with.
Main quests
Act 1Ain't That a Kick in the Head · Back in the Saddle · By a Campfire on the Trail · They Went That-a-Way · Ring-a-Ding-Ding!
Act 2Wild Card (Wild Card: Ace in the Hole, Change in Management, You and What Army?, Side Bets, Finishing Touches) · The House Always Wins (I, II, III, IV, V, VI, VII, VIII) · Render Unto Caesar · Et Tumor, Brute? · Things That Go Boom · Kings' Gambit · For the Republic, Part 2 · You'll Know It When It Happens/Arizona Killer
Act 3No Gods, No Masters · All or Nothing · Veni, Vidi, Vici · Eureka!
Side quests
New California RepublicAnywhere I Wander · Back in Your Own Backyard · Bitter Springs Infirmary Blues · Boulder City Showdown · Can You Find It in Your Heart? · Climb Ev'ry Mountain · Don't Tread on the Bear! · Emergency Radio · Eye for an Eye · Flags of Our Foul-Ups · Hard Luck Blues · I Don't Hurt Anymore · I Put a Spell on You · Keep Your Eyes on the Prize · Medical Mystery · No, Not Much · Pressing Matters · Restoring Hope · Return to Sender · That Lucky Old Sun · The White Wash · There Stands the Grass · Three-Card Bounty · We Will All Go Together · You Can Depend on Me
Caesar's LegionBeware the Wrath of Caesar! · Caesar's Favor · Caesar's Foe · Caesar's Hire · Cold, Cold Heart · I Hear You Knocking · The Finger of Suspicion · We Are Legion
The StripBeyond the Beef · Bye Bye Love · Classic Inspiration · How Little We Know · Pheeble Will · Talent Pool · The House Has Gone Bust! · The Moon Comes Over the Tower
Freeside & Outer VegasBirds of a Feather · Bleed Me Dry · Debt Collector · G.I. Blues · High Times · Someone To Watch Over Me · The Coyotes · Wang Dang Atomic Tango
BoomersAnt Misbehavin' · Sunshine Boogie · Volare! · Young Hearts
Great KhansAba Daba Honeymoon · Cry Me a River · Don't Make a Beggar of Me · Oh My Papa
Powder GangBooted · I Fought the Law · Run Goodsprings Run · Why Can't We Be Friends?
Brotherhood of SteelEyesight to the Blind · Still in the Dark · Tend to Your Business
OtherCome Fly With Me · Crazy, Crazy, Crazy · Ghost Town Gunfight · Guess Who I Saw Today · Left My Heart · My Kind of Town · The Legend of the Star and A Valuable Lesson · Unfriendly Persuasion · Wheel of Fortune
Companion questsED-E My Love · For Auld Lang Syne · Heartache by the Number · I Could Make You Care · I Forgot to Remember to Forget · Nothin' But a Hound Dog · One For My Baby
Unmarked questsA Bit of Slap and Tickle · Access Powers · All Fired Up! · Andy and Charlie · Arachnophobia · Arizona Scavenger · Barton the Fink · Bear Necessities · Big Winner (Atomic Wrangler, The Gomorrah, The Tops, Ultra-Luxe, Vikki & Vance) · Bounty Killer (I, II) · Brotherhood Bond (I, II) · Caching in at the Cove · Cajoling a Cudgel · Claws Mended · Claws Out · Dealing with Contreras · Defacing the Humble Stone · Democracy Inaction · Don't Poke at the Bear · Eddie's Emissary · Exhumin' Nature · Flogging a Dead Corpse · Friend of the Followers · Getting a Leg Up from Andy · Gland for Some Home Cooking · Harder, Better, Faster, Stronger · Hat's Entertainment · Help for Halford · Hidden Valley computer virus · Highway to the Danger Zone (I, II) · Honorary Rocketeer · I Love Bananas · Iron and Stealing · Keith's Caravan Charade · Laurifer Gladiator · Lenk's Bad Debts · Lily and Leo · Long-Term Care · Malleable Mini Boomer Minds · Maud's Muggers · Meeting an Equal · Missing a Few Missiles · Not Worth a Hill of Corn and Beans · Of Boomers and Education · Old School Ghoul · A Pair of Dead Desperados (I, II) · Papers, Please · Pistol Packing · Playing on the Old Joana · Poor Meat Never Makes Good Soup · Powder to the People · Power to the People · Proper Burial · Razzle Dazzle! · Reach for the Sky, Mister! · Rest and Resupply · Ringo's Caravan Rules · Rotface's Loose Lips · The Screams of Brahmin · Silus Treatment · Short-Term Treatment · Smooth-Talking Criminal · Strategic Nuclear Moose · Straus Calls · Strip Search · Saving (or Savaging) Sergeant Teddy · Stocking Up · Suits You, Sarah · A Team of Moronic Mercenaries · Team Spirit · The Thorn Mayhem · Thought for the Day · Tourist Traipse · Trudy's Radio Repair · A Trusted Aide · Useless Baubles or Fancy Trinkets? · We Must Stop Beating Like This · We Must Stop Meeting Like This (I, II, III, IV) · Wind-Brahmin Wrangler · You Gotta Break Out a Few Eggs · You Make Me Feel Like a Woman
Cut contentIcon cut.png Cut questsAuto-Inject Quest · Bright and Shiny · Chip Provenance · Debug Topics · Jailhouse Rock · Meat of Champions (quest) · TempMan · The Thorn Mayhem · Underpass Water Purifier · Viva Las Vegas! · Welcome to Fabulous New Vegas
Add-on quests
Dead MoneySierra Madre Grand Opening! · Find Collars (8: "Dog", 12: Christine, 14: Dean Domino) · Fires in the Sky · Strike Up the Band · Mixed Signals · Trigger the Gala Event · Put the Beast Down · Last Luxuries · Curtain Call at the Tampico · Heist of the Centuries · Big Winner, Sierra Madre
Honest HeartsA Family Affair · Arrival at Zion · Bighorners of the Eastern Virgin · Chaos in Zion · Civilized Man's Burden · Crush the White Legs · Deliverer of Sorrows  · Departing Paradise · Flight from Zion · Gathering Storms · Gone Fishin' · Happy Trails Expedition · Prisoners of War · Retake the Bridge · River Monsters · Rite of Passage · Roadside Attraction · Sanctity of the Dead · The Advance Scouts  · The Treacherous Road · The Grand Staircase · Tourist Trap
Old World BluesAll My Friends Have Off Switches · A Brain's Best Friend · Coming Out of Her Shell · Field Research · He Came... And Went · Influencing people · Midnight Science Fiction Feature! · Old World Blues · On The Same Wavelength · Picking Your Brains · Project X-13 · Sonic Emitter Upgrade · Welcome to the Big Empty · What's In A Name? · When Visitors Attack · X-2: Strange Transmissions! · X-8 Data Retrieval Test · X-8: High School Horror! · X-13: Attack of the Infiltrator!
Lonesome RoadThe Reunion · The Silo · The Job · The Launch · The Tunnelers · The Divide · The Courier · The End · The Apocalypse