The Hidden Bunker is one of the map conditions on Spaceport in ARC Raiders, a timed event where the whole lobby scrambles across rooftops, activates antennas, and races for a sealed underground facility loaded with terminals, loot, and a community mystery that still hasn’t been cracked. The event only happens for short windows, so when it’s active, don’t wait and get straight in. This guide tells how to check for the map condition, where to find the Hidden Bunker, and how to retrieve data to complete the puzzle once inside.
ARC Raiders Hidden Bunker Event
Spaceport occasionally enters the Hidden Bunker map condition, which remains for one hour. You can check the timer on the Play menu—when the Hidden Bunker tile glows yellow, the event will be active. When it’s greyed out, it’s on deck, and the countdown underneath tells you how much time is left for the event to arrive.
The condition loads you into Spaceport with one shared objective across the entire lobby: open the hidden bunker by setting four broadcast antennas online. Once all antennas are activated, every player in the match gets notified, and the underground door to reach Hidden Bunker becomes accessible. Because the activity takes you through some busy parts of Spaceport, equip a loadout that lets you deal with Hornets, Wasps, and the occasional Bastion that wanders the fuel yards.
How to Activate the Antennas
Once you drop into the match on Spaceport with the Hidden Bunker map condition, check your map, and you’ll see four white antenna icons at different locations. They always spawn one each to the north, south, east, and west, but not consistently on the same rooftops.
Their common spawn points include Departure Building, Rocket Assembly, Control Tower, North Trench Tower, South Trench Tower, Vehicle Maintenance, and Shipping Warehouse. Every antenna is placed on a rooftop, so you mostly have to climb ladders or use a zipline to access them. Some towers (like the trench towers or the control tower) almost always require a zipline or respective area key.
When you reach an antenna, you can activate it in these steps:
- Establish the connection – Interact with the terminal when the “Establish Connection” prompt appears. This kicks off a brief upload and spawns a pair of ARC enemies nearby, which you must defeat until the process is done.
- Send the unlock signal – Once they are killed, interact again with the antenna to broadcast the activation.
Once an antenna is live, its icon disappears from the map for the entire lobby. It doesn’t matter which Raiders squad activates them; progress is shared between all Raiders in the current match. When all four antennas are active, an announcement will be made to the whole lobby: “Attention all raiders, Hidden Bunker is now open.”
Where to Find the Hidden Bunker in ARC Raiders
The Hidden Bunker can be found in a shallow clearing between Fuel Processing and the Fuel Lines, in the southwest part of Spaceport. The map makes the area look empty, but the bunker door is built directly into the ground on the strip of open terrain that runs between the two POIs. If you zoom in, you can spot the three pale service roads looping through this zone—the main bunker entrance is on the middle road beside the concrete slab and yellow-striped hatch.
This door is the most direct way inside the bunker, but it’s not the only one. The rocky hillside around Fuel Processing hides two more bunker hatches on the surrounding walls. These side doors all open at the same time once the antennas are activated, so if another squad holds the main hatch, swing south along the lower path and access through one of the alternate entrances instead.
The area is rarely quiet. Bastions march tight loops behind Fuel Processing, Bombardiers drift in from the east, and Rocketeers often walk the upper ridgeline. Stealth works well here, but the ARC patrol paths cross unpredictably, and a single detection can attract half the valley. Once you are inside the Hidden Bunker, turn on your flashlight. The bunker interior is darker than the outside suggests, and Fireballs plus Pods linger between server racks near the initial descent. Stay alert until you reach the terminal rooms deep within the underground.
How to Retrieve Data from the Terminals in the Hidden Bunker
The facility’s main room is a maze of platforms and terminals. A total of eight terminals are active during the event, one on the top floor and seven on the lower level. Each terminal uses a simple color indicator:
- Red — Ready to start downloading the data
- Yellow — Currently downloading the data
- Green — Download completed and data is ready to retrieve
To collect data, you need the terminal to finish a download cycle. You can start one yourself by interacting with a red terminal, which turns the signal yellow. Stay close, as walking away too far cancels the download process and resets the terminal back to red. Once it lights green, interact again to retrieve the data.
Every terminal gives XP, and collecting all eight is required to complete the “Download Data during Hidden Bunker” trial whenever it appears in the weekly rotation. Most teams end up cooperating inside the bunker; even hostile squads have to calm down temporarily because the downloads take time, and losing progress helps no one. But betrayals still happen, so be vigilant when retrieving data.
You only get one retrieval per terminal, but any terminal another squad started still counts for you once the download completes. Once all eight are collected, you’re free to keep exploring the bunker. There’s still an unresolved mystery around these terminals, but extracting safely completes the trial and locks in your XP.
The bunker is filled with loot caches, but the big draw is the puzzle behind the terminals. The community hasn’t completely discovered what the data is used for, whether it unlocks future content, or if it’s linked to a big ARC Raiders world event. For now, it’s mainly a high-XP activity inside an intense PvEvP zone, one of the most competitive spaces on Spaceport whenever it’s active.
