The Doomsday Heist in GTA Online is essentially three heists crammed into one, making it the longest and most difficult heist ever.
Doomsday in GTA Online mainly consists of three thefts, making it the longest mission ever. The first act is all about setting up, so it is vital for the rest of the activities that everything goes smoothly. The potential payout for completing such a challenging series of missions can easily offset that at the end, and our guide will show you how you and your team can get away with as much money as possible.
Act one of Doomsday Heist in GTA Online, subtitled a data breach , has three prep missions, three setups, and one ending before you’re allowed to move on to action two . Being the first part of a much larger heist, the missions in this act will be the easiest of them all, so you and your team can still get away with a ton of money in a short amount of time if you know what to do.
Doomsday Heist Act I Walkthrough in GTA Online
Once you’ve recruited your elite team, at least one of you must acquire or already own the facility and become CEO. Once you’ve done that, you can start the Doomsday Heist and access the Mission Planning Board. You have three prep missions and three customization missions that they unlock, and you will need to return to your facility between each mission to start the next one.
Preparation of Paramedic Equipment
Your first goal of the prep mission is to steal an ambulance with paramedic equipment. This ambulance will be marked on your map, but guarded by the police. It is impossible to negotiate with them, so quickly kill them and send one of your team members to take an ambulance back to your facility. Everyone else should be prepared to protect the driver because any other players in the lobby will be notified of what you are doing and may decide to screw up your plans. The driver will also have to lose cops before they can complete the mission, so they should call Lester as soon as they get the chance.
Installing Dead Courier
Completing this first prep mission will unlock this part where your team will be split in two. One must retrieve the data of the murdered agent from the morgue, while the second is tasked with retrieving the stolen helicopter.
The first team, dressed as paramedics, will drive up to the morgue in your new ambulance and will need to get in and out without breaking cover. Once inside and past the table, turn right to find a cold chamber a little further to the right. You will find three potential bodies to test, so split up and interact with them until you find an agent.
Your next goal is to climb the upper floors, so return the same route you came in and find the fire escape door to start climbing. Go through the door to the left of the elevator you approached, go up the stairs and go straight into a room with several police officers, whom you will have to take out. Try to stay inconspicuous if possible. From this room, go through the other door on the right and use the laptop to start downloading data. Once completed, you’ll have to fight your way to the exit to be picked up by a second team in a helicopter.
Team two is apparently responsible for the delivery of said helicopter and for team one. Start by getting to La Mesa and wait for the savage. Hop inside and follow the helicopter to the heights of El Burro, where you will need to destroy a ton of guards and grab the briefcase. After that, you just need to take the helicopter, pick up the first team and lose the cops.
Deluxos Prep
This preparation is as easy as it is in GTA Online . Follow the waypoint, kill some guards to get the key, use it to open the garage and steal four Deluxe. On the way back, you will need to stop at LS Customs to repaint the cars, but otherwise it’s a good quick and easy setup.
Configuring Signal Interception
Now that you have your Deluxos, you need to use them to hack into four targeted vehicles as they move. You can all split up to take on a different target to complete the mission faster, just make sure you are at a safe distance behind the trucks you hack so the people inside cannot shoot you. If any of your Deluxos gets destroyed, you will have to restart, so be careful. Once the hack is complete, blow up the truck.
A new set of targets will appear after the first four are hacked and destroyed, this time boats instead of trucks. Enter hover mode and repeat the same process as before to hack boats.
The final target is at LSIA airport where you need to hack the Jumbo Jet. Take off after him and have one person maintain the break-in distance, while the other three will watch the helicopters approaching for an attack. Use your gripping rockets to destroy them before they even get close, then do the same with the plane when you have the data.
Shark preparation
This is another easy task on paper, but can be dangerous. You will be sent to Fort Zancudo to hack into the computer in the control tower to find out the location of the Shark helicopter. Your best bet is to dash inside and go right to the elevators to safely reach the top of the tower. From now on, you only have nine minutes, so interact with your phones immediately to start downloading data.
If you still went unnoticed, you would no longer be there. Keep all the attackers here until the download is complete, then make a frantic dash back to head towards the Shark’s location. Steal a car, preferably an armored one, and fight your way through the fences to escape as quickly as possible. After leaving the base, you will quickly reach the airport, where there are only a few guards standing between you and Shark. Return him to base to complete the preparation.
Server Farm Configuration
Your ultimate goal of the first act is to break into the NOOSE object and steal data without getting caught. Staying hidden in GTA Online is quite finicky, so move slowly and make sure everyone has stealth activated as well. Use silenced pistols to shoot the cameras upon arrival, as well as the guards at the back doors. You need to wait for the head of security to kill him and get inside.
Make your way inside, shooting only when no other guard can see, and slowly get down to the server room. Take your time and kill all the guards before hacking into the three marked targets. Cover each other when new guards start arriving and head to the elevator once all break-ins are complete. Jump back to your Shark and get out of there.
Final
After all the settings and preparations are completed, you can proceed to the finale of the first act . Each team member will be assigned a role, so choose carefully who will be responsible for what. Basically, you will go to the IAA base to infiltrate and kill their hackers. There are a lot of guards here, so come with good armor and plenty of ammo. Storm the base, killing everyone inside, to get to the War Hall. This is where your roles will start to come into play as you all have different positions on the cameras. The mission will end as soon as your team takes out all the enemy reinforcements that have returned to the street, the video scene will trigger and you will unlock action two from Doomsday Heist backs on your enterprise.
