LSC-004 / Underground Facility, Blaine County
The Doomsday walkthrough
Three self-contained acts with escalating stakes. Act II is the best payout-per-minute for a strong duo; Act III has the largest total take and the hardest finale in GTA Online. Every act can be run on hard mode for a bonus.
Players
2–4
Payout
$650K – $1.5M per act
Difficulty
Hard
Cooldown
None
Entry cost
$1,250,000
Layout map
Doomsday operations — setup zones and finale objectives
Gold markers are mission stages. Red zones are heavy-resistance areas.
Map key
- 1
Setup staging
Facility vehicle preps launch from Blaine County.
- 2
Facility
Your planning board and vehicle storage.
- 3
Salvage site
Underwater hard drive recovery.
- 4
Submarine breach
Act II finale infiltration point.
- 5
Silo control room
Act III wave defence and terminal sequence.
- 6
Extraction
Avenger pickup zone.
What you need
- →A Facility ($1,250,000 — the cheapest is Route 68)
- →Two players minimum for every finale
- →An Avenger or Akula strongly recommended for setups
- →Solid pilots — several setups are air-combat missions
Recommended loadout
- →Heavy armour and maximum snacks before every finale
- →Homing Launcher for Act II's air sections
- →Akula (stealth mode) for open-world setup travel
- →A Thruster or Deluxo from the facility for mobility
- →Assault Rifle Mk II with incendiary rounds
Crew roles
Host
Pays the setup costs and picks hard mode. Take the largest cut.
Pilot
Flies the Avenger, Volatol and Akula sections. The highest-skill role.
Hacker
Runs the terminal minigames in the data breach and the silo.
Ground team
Clears the facility interiors and holds objectives.
Prep missions
- 01
Act I — The Data Breach
Setups: Server Farm, IAA Deep Dive, Rescue ULP. Finale is a tunnel escape in the Ramp Buggy.
- 02
Act II — The Bogdan Problem
Setups: Submarine Recon, Rescue ULP, Salvage Hard Drives, Bogdan Problem finale on the submarine.
- 03
Act III — The Doomsday Scenario
Setups: Barrage, Khanjali, Avenger, Rescue ULP. Finale is the missile silo assault.
- 04
Buy Facility VehiclesOptional
The Thruster and Deluxo unlock through Doomsday preps and are the best mobility purchases in the game.
Step-by-step finale
Payout $1,200,000 (+ hard mode bonus)
Difficulty Hard
Best for The best payout-per-minute of the three. Run this on repeat with one reliable partner.
- 01
Submarine ReconMap 1
Fly out, scan the submarine, avoid the sonar sweeps. Use the Akula's stealth mode.
- 02
Rescue ULPMap 2
Straightforward escort. Bring an armoured vehicle.
- 03
Salvage Hard DrivesMap 3
Underwater collection. The Kosatka or a Toreador makes this trivial.
- 04
Finale: board the submarineMap 4
Swim in, fight through the sub interior, plant the charges.
- 05
Disarm the nukeMap 5
The bomb-defusal minigame. One player reads, one player cuts. Communicate clearly.
- 06
Escape the subMap 6
Fight your way back out and extract by air.
Payout table
- Act I finale$650,000
- Act II finale$1,200,000
- Act III finale$1,500,000
- Hard mode bonus+25% (Act III)
- All-acts bonus$1,500,000
Expert tips
- →Run Act II on hard with a competent duo — it is the best money-per-minute in the whole Doomsday chain.
- →Complete all three acts in order with the same crew for the criminal mastermind bonus.
- →Bring the Akula for any setup that involves open-world travel with hostiles.
- →Elite challenges require no deaths and a strict time limit — assign roles before launching.
Common mistakes
- ✕Launching a finale without maxed snacks and armour.
- ✕Letting an inexperienced pilot take the Avenger section.
- ✕Attempting Act III with two players — it is designed for four.