Venturing into Atomfall‘s Interchange for the first time reveals numerous locked doors, each leading to potential treasures or important information. While many of these barriers can be unlocked with Atomic Batteries, some require specific keys and further exploration. One of the notable locked doors is the Site Office, located right at the Slatten Dale entrance. Unlocking it is essential for gaining access to valuable loot. In this guide, we will help you locate the Site Office Key, which is crucial for accessing this area and enhancing your gameplay experience.
Locating the Site Office Key in Atomfall

Once you arrive at Atomfall’s Interchange through Slatten Dale, look for the Site Office, which is situated in a locked building on the left side. To obtain the Site Office Key, your first task is to restore power to the Central Processor and Data Store Delta using one of the available Atomic Batteries. This step is crucial as it sets the stage for further exploration and unlocking additional areas.
Before progressing, ensure you acquire a Signal Redirector, as it will be necessary for your journey ahead.
Gaining Access to Robotics and Restoring Power

With Data Store Delta powered, you can now access the Robotics sector of the Interchange. Navigate carefully past the patrolling B.A.R.D. robots and turrets to find the door marked ‘Robotics.’ It’s advisable to avoid conflict with the robots unless absolutely necessary, as sneaking may save your resources for tougher battles ahead.
Inside the Robotics area, utilize your Signal Redirector on the orange wall panels to reroute power to the large gray door at the end of the room, labeled ‘Lower Level.’ Your goal is to unlock this door, which leads further into the Interchange.
- Use the window on the right of the Robot Assembly – there are yellow panels to reroute from here.
- Access the area left of Power Control Beta – more yellow panels await your attention.
- Activate the Wing Power Control switches found in both the Robot Assembly and Power Control Beta rooms.
Completing these tasks will restore power but will also activate an electric field around the Lower Level door. To disable the electricity, jump onto the crates in front of the door and use the Signal Redirector on the panel to the left. You can then release the lock to gain access to the Lower Levels, where the Site Office Key awaits.
Navigating to the Construction Site for the Site Office Key

Once inside the Robotics Lower Levels, your next move is to restore power to the Maintenance area, which is bustling with more B.A.R.D. Robots and Turrets. Head through the orange ‘Control Room’ door to continue your quest. Keep moving forward until you locate a smoky, circular tunnel leading to another section of the Interchange.

Traversing this tunnel will bring you to the Construction Site, right below the Site Office. Rumor has it that the Site Manager hid the Site Office Key here. Continuously move onward to spot the Site Office Key resting on a corpse amidst a group of dangerous Feral enemies. Be prepared for combat when approaching, as many enemies will activate. Secure the Site Office Key when the area is safe.
Shortcut and Loot in the Site Office

With the Site Office Key in hand, head back to the Site Office near the Interchange entrance. A handy shortcut can be accessed by climbing the nearby ladder where you found the key. From there, open the gate ahead to reach the Site Office.
Inside, you can unlock either of the two doors using the Site Office Key to discover a trove of loot. A special highlight is a case containing a Training Stimulant and Combat Stim Recipe, alongside various collectibles, detailed below:
- SMG Ammo
- Scrap
- Gun Oil
- Glass Tumbler
- A finding titled “A Sea Change At Seascale?”
This guide has provided you with essential information on locating the Site Office Key in Atomfall. Remember, there are numerous other locked doors scattered throughout the Interchange, each hiding further secrets to uncover as you delve deeper into the game’s rich environment.