To open the Hidden Bunker, activate all four rooftop antennas during the Hidden Bunker map condition on Spaceport. Each antenna triggers an ARC attack: defeat the enemies, then return to finish the activation. When all four are active, the raid receives an announcement that the bunker is open. Its entrance is in western Spaceport near Fuel Processing.
This is a map-condition event, not a door puzzle available in every raid. Check the Spaceport map condition in-game before setting out; availability and event steps may have changed since the guides cited below.
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1. Check that Hidden Bunker is active
Before you plan the run, confirm that Spaceport has the Hidden Bunker map condition. Embark temporarily removed the event from rotation at one point to address exploits, and the game’s design director later discussed possible revisions to event designs. Those are historical reports, not confirmation of the current rotation or current mechanics. GamesRadar reported the temporary removal; its later report covered the design discussion.
2. Locate the four antennas
Open the Spaceport map and look for four antenna or pylon icons. The objectives are visible on the map, but their rooftop locations vary. The ARC Raiders Wiki notes that zooming the map all the way out can make the icons easier to spot and show the remaining antennas. See the wiki’s Hidden Bunker guide.
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You do not have to complete all four with one squad member. Progress is shared across the lobby, so players or teams in the same raid can work on separate antennas. GameSpot’s guide describes this shared effort.
3. Activate each antenna
- Reach an antenna and interact with it once to start the objective.
- Prepare for an alarm and an ARC attack. The wiki identifies Wasps and Hornets among the enemies that appear.
- Defeat the attackers, return to the antenna, and interact again to complete its activation. GameSpot calls the completion prompt “Send unlock signal.”
- Repeat at the other three antennas. The raid-wide announcement confirms when all four are active and the bunker opens.
Some rooftop approaches can be awkward; GameSpot’s 2025 guide says an in-game zipline can help reach certain positions. It is route advice, not a requirement for every antenna.
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4. Find the open bunker
Head to western Spaceport after the opening announcement. GameSpot places the entrance in a rocky field east of Fuel Processing; Insider Gaming describes it as between Fuel Lines and Fuel Processing. Read Insider Gaming’s location guide.
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GameSpot reports weapon and ammunition crates inside, as well as terminals that let players wait for a data download and select “Retrieve Data.” Its 2025 guide reports 500 XP per terminal; Insider Gaming independently reports the same XP amount and describes eight terminals. These are guide-reported details, not a guarantee of what a current raid will award. The cited guides do not establish that retrieving the data unlocks another known objective.
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The bunker is not exclusive to the team that activated the antennas: other players in the lobby can enter. Expect possible competition at the entrance or other raiders waiting nearby, and weigh the extra terminal XP against the risk of staying inside.
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Practical choices during the run
- Split up or stay together: Separate players can cover antennas faster because progress is shared, while moving as a group keeps more teammates together for the ARC fights.
- Prioritize safety or speed: A direct rooftop route may save time, but each activation draws ARC enemies and the opened bunker can attract other raiders.
- Decide whether to linger: Terminals offer guide-reported XP, but the bunker can be contested. Secure the approach before committing to downloads.
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