A Player's Guide to The Doomsday Heist: Act I Finale (The Data Breaches)

[QuantumNova]

For players progressing through GTA Online's Doomsday Heist, the finale of Act I, "The Data Breaches," is a straightforward but intense mission. Here’s a breakdown of how it typically plays out, what to expect, and how most teams approach it.

What is the main goal of this mission?

In short, your crew is attacking an IAA ( Intelligence Administration Agency) base to prevent a server hack and stop a paramilitary assault. You'll fight through the base, defend a position using turrets, and extract. It's a direct assault mission with a defensive holdout phase, which is common in many GTA Online heists.

How does the mission start and what's the first step?

After the cutscene where Avon Hertz convinces the team to act, you'll spawn outside your Facility. The objective is simple: drive to the Satellite Relay Station in Grand Senora Desert. Most players use either armored vehicles like the Kuruma or weaponized vehicles like the Oppressor Mk II to get there quickly, though the latter can make the initial combat too easy. Once you arrive, you'll see Merryweather forces guarding the entrance. The standard practice is to clear these enemies from a distance before moving in, as rushing the gate usually results in taking unnecessary damage.

What should we expect inside the IAA base?

The interior is a linear series of corridors and rooms. You'll face waves of Merryweather soldiers. Their accuracy and aggression are typical for a heist finale—they can be tough. Teams usually move slowly, using cover effectively. One player often takes point to draw fire while others flank or provide sniper support. It's crucial to communicate and not spread out too much, as revive distances can be problematic. Ammo and armor consumption here is generally high, so coming prepared is advised.

What happens during the turret defense section?

After fighting to the server room and war room, you'll man stationary turrets to defend against incoming vehicles and helicopters. This is the core defensive holdout. In general, two players should focus on the fast-firing cannons to eliminate Buzzards quickly, while others use the machine guns for ground vehicles. The key is prioritizing threats; the helicopters deal the most damage. The defense ends when the threat meter depletes. Some crews struggle here by not focusing fire, leading to failed attempts. It's a section that punishes lack of coordination but is very manageable with clear roles.

Are there any notable tips for completing this efficiently?

Yes. First, bring heavy weapons and full armor. The Combat MG Mk II is a popular choice for its damage and ammo capacity. Snipers are useful for the initial outdoor approach and some long sightlines inside. During the turret section, don't waste cannon shots on single foot soldiers; save that ammo for vehicles. Also, while the mission allows you to chase fleeing enemies at the end, most experienced players ignore them to complete the mission faster. It's worth noting that some players, seeking to bypass the grind of this and other heists, might look for shortcuts online, such as searching for gta 5 modded accounts for sale ps4. However, most of the community finds that earning progress through gameplay, even with its repetitiveness, is more secure and ultimately more satisfying than risking account penalties from external sources.

What is the mission payout and is it worth replaying?

The payout for this finale is moderate for a two-player heist but decreases slightly with more players due to the split. Its main value is in progressing the Doomsday narrative and unlocking trade prices for certain vehicles. Replay value depends on the player. Some enjoy the combat sequence and replay it with different tactics, while others move on to the more complex and lucrative Act II and III finales. For crews new to heists, it serves as good practice for the communication and coordination needed in later, harder missions.

What follows after completing this mission?

The cutscene sets up Act II by introducing the primary antagonist, Bogdan. You'll return to your Facility where you can immediately start preparing for the next act. The mission itself is a direct action piece with less planning complexity than some others, serving as a narrative and gameplay bridge to the more elaborate heists that follow.