The Doomsday Scenario is the third and final part of the Doomsday Heist update in GTA Online. In this mission, the crew has to stop Avon and a rogue AI called Clifford from unleashing a weapon of mass destruction.

In this guide, we are going to walk you through the Act 3 Finale of The Doomsday Heist.

Doomsday Heist Act 3
Doomsday Heist Act 3

Details about The Doomsday Heist Act 3

For those who have completed The Doomsday Heist Act 1 and Act 2, this is the last part to finish this heist in GTA Online.

Heist preps

In this heist, you would have to steal a lot of data, misc items, and vehicles prior to the finale.

Tm02khanjali Gtao Front
The Khanjali Tank in GTA Online
  • Prep 1(a) – Marked Cash
  • Prep 1(b) – Recon
  • Setup 1 – Rescue Agent 14
  • Prep 2 – Chernobog
  • Setup 2 – Escort ULP
  • Prep 3 – Flight Path
  • Setup 3 – Barrage
  • Prep 4 – Test Site Intel
  • Setup 4 – Khanjali
  • Prep 5 – Onboard Computer
  • Setup 5 – Air Defenses
The Chernobog Anti Air Launcher
The Chernobog Anti Air Launcher


  • $1,200,000 (Normal)
  • $1,500,000 (Hard)

Elite Challenges

  • Complete in under 30:00 minutes
  • 0 hacks failed
  • 150 headshots
  • Nobody gets wasted

>>> Read more: How To Escape The Cops At Max Wanted Level In GTA 5

Step by step guide for the Act 3 Finale

This finale is the hardest mission in the quest chain - it is even harder than the finales of the previous arcs. Buy the maximum amount of snacks and armor you can before proceeding. Bring the best weapons you have.

First, use the Khanjali tank to get through the tunnel entrance of the base. Destroying blockages and get to the end of the tunnel. 4 Juggernauts would spawn - you need to use the tank's rail gun to kill them. Afterward, get out of the tank and proceed toward the base. Kill all enemies on your way.

Khanjali Juggernauts
Move through the tunnel using the Khanjali tank

Another Juggernault would spawn as you reach a little open doorway. Pre-aim at that spot and kill it. At the intersection, get the supply box on the right side then go left. Keep going forward and eliminating enemies as they spawn, then snipe the supply box at the end of the passage. There is another supply box in a small room on the right as well.

Intersection Right Left
The left side is the correct choice

Keep moving forward until you reach the hangars. Take a right to find two more supply boxes on either side of the room by the planes. Move through the hangar and go right - kill more mobs as you proceed. Two more Juggernauts will spawn at the end of the passageway.

the hangar
The supply boxes inside the hangar

Proceed toward the control center, take out all enemies and rush to the first servers. Start hacking as soon as you reach it - just be careful as the elite challenge requires you to not fail any hacks. Ask your friend to cover while you are hacking. The minigame is fairly simple - you just need to break the blue nodes by passing the signal through them... while avoiding the red ones.

Hacking Interface
The Hacking Minigame is the most annoying part in GTA Doomsday Heist act 3

Repeat the process three more times for the rest of the servers. Kill the remaining enemies then go upstairs to the Orbital Cannon room. Use it to destroy four more servers. Afterward, make your way to the Silo.

Orbital Cannon Control Panel
The Orbital Cannon Control Panel

Fight your way in. Just take your time clearing out enemies as there are a lot of them. Keep going forward until reaching the end, with Avon fleeing using a jetpack. Get on your own Jetpack and chase him. The mission will end after you kill Avon and return to the Observatory.

Avon Escaping
Avon trying to escape

This is the end of our guide for GTA Doomsday Heist Act 3. Interested in more of our articles related to the GTA Series? Please check out this post for the Top 5 Hardest Achievements To Get In GTA 5.