The Spaceport Hidden Bunker event and map modifier in Arc Raiders is a special limited time occurrence in which players will have to rush around and trigger various antennae across the map. Doing so will open up the Hidden Bunker, a heavily guarded underground area filled with loot and more than a few enemies.
Below I'll explain the various steps involved in the Hidden Bunker map modifier, the locations and requires of the four antennae, and how to get inside the Bunker and unlock it. Keep in mind that this isn't an easy thing to do, especially if players aren't cooperating, so be prepared for a real challenge.
How to complete the Arc Raiders Hidden Bunker and find the Antennas
The Hidden Bunker requires players to find and activate four Antennas around the map. They're marked by White Icons of Radar Dishes, which are randomly placed in each game but always on the rooftops of random buildings that shouldn't require keys to access them.
When you trigger an Antenna it will spawn a wave of enemies, such as Arc Raiders Hornets and Wasps. Deal with them and then you'll be able to activate it fully. At this point all the players in the game will be alerted, and when all four are done a final alert will state the bunker is open. There's an element to strategy here as, if the last Antenna is miles away from the bunker, you probably don't want to be the one triggering it - all the loot will be gone before you'll be able to reach the bunker.
Hidden Bunker location
The Hidden Bunker is found in the South West corner of the map, near the Departure building, between Fuel Processing and the Fuel Lines. There are actually several doors to the Bunker in this area, with more giving you a back way in even further south west, any of which should work to access it.
The Hidden Bunker is surrounded by various Arc Raiders enemies, with Bastions, Bombadiers, Rocketeers, Hornets and Wasps all patrolling the area. It is possible to stealth around them but it's not easy and just one of them spotting you can set them all off. So unless you're an absolute master of stealth, backed up by a few friends or using a Photoelectric Cloak, make sure you have all the best Arc Raiders weapons ready to fight with.
Hidden Bunker rewards and loot
Inside the Hidden Bunker are eight terminals you can download data from. To do that you'll need to activate them and stay nearby until the light turns green. That will give you XP, while downloading data during the Hidden Bunker event can also be a Trials event reward, depending on when you do it.
There's also some Weapon Cases, Medical Bags, Grenade Tubes, Ammo Case and so on to loot, as well as plenty of general containers to rifle through. There's a chance to get a Volcano blueprint here so open up everything you can find to get another roll of the RNG dice. There's also supposedly a chance of getting the blueprint searching all the breachable containers in the Space Port tunnels but I've yet to see that myself.
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