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The psycho-analytic cardiac-dampening sneaky stealth suit, a suit like NOTHING this world has ever heard, seen, or could EVER see!Borous

X-13: Attack of the Infiltrator! is a main quest in the Fallout: New Vegas add-on Old World Blues. The Courier is tasked to find all the Stealth suit Mk II individual suit components.

Upon completion, the Courier is awarded with the "Cardiac Arrest!" trophy/achievement. Part of this quest overlaps with the subsequent Project X-13 and the suit itself.

Quick walkthrough[]

Main Quest: X-13: Attack of the Infiltrator! 
Travel to the X-13 research facility
Recover the prototype X-13 gloves, boots and chest plate
Activate the basic infiltration test to begin initializing the assembled stealth suit Mk II
Basic infiltration test: acquire the X-13 document from the administrator's wall safe to complete stealth suit initialization. 
Reward: Various magazines, energy weapon ammunition, stealth suit Mk II, and Cardiac Arrest achievement/trophy 
Leads to: Project X-13 

Detailed walkthrough[]

  • Enter the X-13 research facility, located near the perimeter fence to the west of the Big MT dome.
  • From the entrance door, go through the reception area into the corridor ahead. (For reference, to the right is a small room sealed with a force field; entry is not required for this quest.)
  • Turn left and explore the rooms adjoining the corridor. The three parts of the stealth suit Mk II can be found here (boots, gloves, and chest plate), along with terminals detailing the development process.
  • Once all parts of the suit are assembled, continue along the corridor and open the door at the end, which leads the player character towards the testing area.
  • The Courier's objective is the door ahead, across the walkway spanning the large force field.
  • Accessing the nearby terminal with the stealth suit Mk II in the player's inventory will unlock the door, allowing entry to the testing area.
  • If the Courier is wearing the suit upon entry, it will comment on the test and direct the player's attention to the start area and test terminal below them. They can make their way down (via the stairs) through the doors ahead, or simply jump down into the room.
  • Activate the test terminal to start the basic infiltration test, in order to begin initializing the stealth suit.
  • The player can freely explore the entire area before beginning the test. A search of the walls and desks will reveal many (currently inert) laser tripwire emitters used in later (optional) tests. With a Science or Repair skill of 50 these can be permanently disabled or hacked (from a red laser beam to a blue, reading the Courier as friendly; no alarms will trigger when crossing the blue beams). One can also destroy the patrolling robots to make the trip easier.
  • Once the player begins the test, they must make their way through the area, avoiding any patrolling robobrains. If the Courier is detected, the test will reset and they must return to the test terminal to start again.
  • Find the administrator's office and retrieve the X-13 document from the wall safe. Doing so will complete the quest and shut down all security measures. A reward will appear in the safe next to the test terminal.
    • There are several routes through the area on the lower floor to reach the safe. Alternatively, the player can start the test then turn right from the test terminal and go upstairs to the observation level. The player can make their way to the area above the administrator's office and simply jump down to reach the safe, avoiding the security.
  • Once the Basic infiltration test is complete, the stealth suit Mk II will be upgraded (Sneak bonus increased by +10, to 25). Also note that enemy robo-scorpions will appear throughout the X-13 facility under the direction of Mobius.
  • Completing this quest will also continue Project X-13, allowing the player to further upgrade the stealth suit Mk II.

Quest stages[]

10 Travel to the X-13 Research Facility.
20 Recover the Prototype X-13 Gloves.
30 Recover the Prototype X-13 Boots.
40 Recover the Prototype X-13 Chest Plate.
50 Activate the basic infiltration test to begin initializing the Stealth Suit.
60Quest finishedBasic infiltration test: acquire the X-13 document from the Administrator's Wall safe to complete Stealth Suit initialization.


  • When exiting X-13 after quest completion, a group of robo-scorpions will be waiting outside.
  • Robo-scorpions appearing inside the facility will not set off active laser trip wires.
  • There is a very easy method to completing the test. In sneak/stealth mode, the Courier can ascend the stairwell back upstairs, and walk to a door which requires a 75 level lockpicking attempt to open. Opening the door, the Courier can walk to the end of that area, and upon looking down, will see the C.E.O.'s office. The Courier can then carefully drop or jump down behind the desk without having to deal with the laser, and then open the wall safe and retrieve the X-13 Document.


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 · A Final Plan for Esteban · Access Powers · All Fired Up! · An Ear to the Ground · 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 · Fight Night · Flogging a Dead Corpse · Friend of the Followers · 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 · Most Wanted · Not Worth a Hill of Corn and Beans · Old School Ghoul · A Pair of Dead Desperados (I, II) · Papers, Please · Pistol Packing · Playing on the Old Joana · Powder to the People · Power to the People · Razzle Dazzle! · Reach for the Sky, Mister! · Rest and Resupply · Ringo's Caravan Rules · Rotface's Loose Lips · Saving (or Savaging) Sergeant Teddy · The Screams of Brahmin · Silus Treatment · Short-Term Treatment · Smooth-Talking Criminal · The Star Showdown · Strategic Nuclear Moose · Straus Calls · Strip Search · Suits You, Sarah · Tags of Our Fallen · A Team of Moronic Mercenaries · 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 · Wind-Brahmin Wrangler · You Gotta Break Out a Few Eggs · You Make Me Feel Like a Woman
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 · Return to the FountainCut content
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