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If you’ve spent any time in Arc Raiders, you know how valuable loot can be. From simple crafting materials to powerful weapon parts, everything can be used to improve your gear. The best place to find these materials is in a secret underground bunker located in humanity’s last known port.
The Hidden Bunker event only shows up at specific times during the day. Finding it requires careful planning and some luck. Usually, you team up with other players to loot the entire bunker, but beware—some raiders might try to betray you and take what you’ve collected.
How to Unlock the Hidden Bunker
The Hidden Bunk only appears at the Spaceport during certain hours, similar to Night Raids. However, these times are based on real-world time zones. For example, it can be found at 4:00AM UTC, 10:00AM UTC, and 7:00PM UTC. This can make it challenging for casual players, but with patience, it’s possible to join in.
Participating in this event is optional, so only enter the map if you’re planning to loot. If not, just load into the regular Spaceport map. The hidden bunker is available for about an hour each time, which means you might get two opportunities to raid it if you’re quick. Otherwise, you get just one shot per session to unlock and loot the bunker.
Once you arrive at the Spaceport, you’ll see a notification about a hidden bunker filled with gear and data. The bunker is heavily protected by Arc units, so make sure your equipment is ready for a fight.
Tip: Use a free loadout first to get familiar with the layout and feel of the mission. This way, you won’t risk losing your best gear during the raid. However, remember that support from other players might be limited during this event.
Where to Find the Hidden Bunker Antennas
There are four antennas scattered across the rooftops of the Spaceport, and they are key to opening the bunker. The exact locations are random each time but will be marked on your map. Generally, there’s one in each direction: north, south, east, and west. Use your surroundings to reach them—climb onto nearby structures or find creative routes.
You don’t need to activate every antenna yourself, as other players may have already done so. When an antenna gets activated, a notification appears for all players. To activate an antenna, go to the rooftop and interact with its console. Wait for a few seconds until it establishes a secure connection, all while fighting off Wasp and Hornet Arc units that come to investigate the noise. Once connected, interact again to complete the activation.
Warning: Rooftops can be open and exposed, so act quickly and watch your step to avoid falling.
Once all four antennas are active, a message will inform everyone that the Hidden Bunker is open. The challenge then is to race down to the bunker, which can be a short walk or a long trek across the sands, depending on your spawn point. Stay alert, navigate carefully, especially at night, and conserve your ammo for the fight ahead.
Hidden Bunker Location
The bunker is situated in the southwest part of the map, between the Fuel Processing plant and Fuel Lines. It’s just south of the Departure Building, near an elevator and concealed within a hill. The outside lights mark its position, making it easier to spot once you’re close.
When you reach it, expect resistance—Bombarier and Bastion units patrol the entrance, with Wasp and Hornets nearby. Snitches fly overhead, calling in reinforcements. Use heavy firepower and plenty of explosives to get through their armor. A strong shield and multiple ways to recharge it are important, and looting fallen Arc units can supply useful parts.
Tip: You could try sneaking in, but there’s more fun in a firefight. After the units are down, everyone can loot the remains for valuable gear. Team up to speed through the raid or sneak past enemies in the chaos to make sure you get first pick. Just be prepared for possible backlash—whether from enemy fire or flying ticks.
What to Do Inside the Bunker
Once inside, your goal is to collect data from eight different consoles on various floors. Walk up to each one and interact to start downloading. The consoles have indicator lights: red means data is ready to collect, yellow shows the download is in progress, and green indicates the data is ready to be gathered.
Tip: Stay close to each terminal to ensure the download completes successfully.
While working inside, you can break open lockers for parts and resources. Be cautious—small Arc units and ticks hide inside dark corners, so clear comms are vital to avoid surprises. After gathering all the data, head for the exit. Be aware that additional Arc reinforcements may appear as you leave; if overwhelmed, try to sneak past or head toward the elevator located about 100 meters north of the bunker for a speedy escape.
Tip: Save your ammunition for the final escape, as confronting all the Arc units outside might not be worth it.
Loot the bunker thoroughly after collecting the data—but always prioritize your safety. If you’re caught outside or overwhelmed, you risk losing all your hard-earned loot, including rare items and materials.
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