While most areas in Once Human are accessible to everyone, some places are off-limits, such as the Underground Bunker at Aiden's Hideout on the map. You'll need the Bunker Access Card to enter.
Once Human Bunker Access Card
The Bunker Access Card in Once Human allows you to open the Underground Bunker, giving you access to many weapons and storage crates with rare loot. Obtaining the access card is a worthwhile endeavor, and you can also farm Acid by killing low-level Deviants in the Bunker.
Here's everything you need to know about the Bunker Access Card and where to use it in Once Human.
The location for the Bunker Access Card in Once Human is in the city of Throughville in the Dayton Wetlands region, roughly around the coordinates (6417, -5129). There you will need to find the area with barbed wire and vehicles on a deserted street.
