- What to know
- What the Hidden Bunker is
- How the Hidden Bunker event appears
- Unlocking the bunker through antenna activation
- Where the Hidden Bunker is located
- What happens inside the Hidden Bunker
- Extraction is mandatory for rewards
- Current status of the Hidden Bunker
- Why the Hidden Bunker matters
- Is Hidden Bunker available after the event ends?
What to know
- The Hidden Bunker is a timed event exclusive to the Spaceport map
- It requires a shared, lobby-wide unlock process
- You must survive and extract to keep any rewards
- The event is currently disabled due to exploits but is expected to return
In ARC Raiders, the Hidden Bunker stands out as a large-scale cooperative world event rather than a standard loot run. Unlike static locations that are always accessible, this bunker is designed to feel secretive and temporary. When active, it reshapes how the entire Spaceport map plays, pushing players into risk-heavy decisions where cooperation and competition overlap.
This guide explains how the Hidden Bunker is designed to work, from its activation conditions to what happens inside, and why it has been temporarily removed from rotation.
The Hidden Bunker is a special underground facility that appears only during specific Spaceport map conditions. It is not visible or accessible during normal missions. Instead, it becomes available as part of a timed world event, where players must work—either knowingly or unknowingly—toward unlocking it.
Unlike traditional high-loot zones, the bunker is locked behind a multi-step, shared objective, making it one of the few activities in ARC Raiders where lobby-wide progress directly affects everyone’s run.
The event only spawns when the Hidden Bunker map condition is active on Spaceport. Before deployment, players can see an indicator or countdown showing that this condition is in rotation. If the condition is not active, the bunker simply does not exist for that match.
Once the match begins, the bunker remains sealed. No player can access it immediately, regardless of gear, keys, or progression.
Unlocking the bunker through antenna activation
The core unlock mechanic revolves around four rooftop antennas scattered across the Spaceport map. Their locations change between matches, forcing exploration and map awareness rather than memorization.
Each antenna must be interacted with twice. The first interaction triggers an alarm and spawns hostile ARC enemies, such as Wasps and Hornets. This phase is intentionally loud and dangerous, often drawing in other players who may want to contest or disrupt the activation.
The second interaction completes that antenna’s contribution toward unlocking the bunker. Importantly, progress is shared across the entire lobby. One player does not need to activate all four antennas alone.
| Unlock element | How it works |
|---|---|
| Antennas required | 4 total |
| Interactions per antenna | 2 |
| Enemy response | ARC units spawn on first use |
| Progress type | Shared across lobby |
Once the fourth antenna is completed, the game broadcasts a raid-wide announcement confirming that the Hidden Bunker is now open.
After unlocking, the bunker entrance becomes accessible in the southwestern section of Spaceport, typically between the Fuel Processing and Fuel Lines landmarks. The entrance leads downward into an underground complex and may have multiple access points depending on the match layout.
Because the unlock announcement is global, any surviving player can attempt to reach the bunker, which often turns the area into a late-match hotspot.
Inside, the bunker shifts the focus away from raw combat and toward objective control and survival. The interior contains corridors, rooms, and multiple data terminals placed throughout the facility.
To interact with a terminal, a player must remain close while a progress bar fills. This creates vulnerability windows where movement is restricted, increasing the danger from both enemies and other players. The bunker’s tight layout amplifies tension, as escape routes are limited and sound travels easily.
While the full depth of the bunker’s internal mechanics has never been fully documented, the intended loop is clear: activate terminals, collect data, manage threats, and get out alive.
Extraction is mandatory for rewards
Like all high-value activities in ARC Raiders, nothing is secured until you extract. Unlocking the bunker, activating terminals, or collecting loot means nothing if you die before extraction.
This makes the Hidden Bunker especially punishing. Players often enter late in the match with full inventories, meaning a single mistake can erase an entire run’s worth of progress.
As of late 2025 and early 2026, the Hidden Bunker event has been temporarily disabled. Players discovered unintended ways to access the bunker without completing the antenna unlock process, which led Embark Studios to remove the event from rotation.
The mechanics described here reflect the intended design, not the current live state. The expectation is that the event will return once exploits are addressed.
The Hidden Bunker represents ARC Raiders at its most ambitious. It combines:
- Shared world objectives
- PvE and PvP pressure
- Timed progression
- High-risk extraction
Few other activities force players to weigh cooperation against betrayal so directly. When active, the bunker can dominate an entire match’s flow.
Yes, Hidden Bunkers are accessible even after the event concluded. The Hidden Bunker is not just a loot zone—it is a statement about how ARC Raiders handles large-scale events. Shared unlocks, dangerous objectives, and extraction pressure turn it into one of the most memorable experiences the game offers. While it is currently disabled, understanding how it works prepares you for its return, when every antenna activation and every step underground could decide the fate of your run.
