This guide will tell you how to solve the Atomfall Data Store Charlie Store Room Button Puzzle so you can get access to the Data Store C Store Room.

How to reach Data Store Charlie in The Interchange
You can reach Data Store C by heading to the Slatten Dale entrance of The Interchange in Atomfall. You will need at least one Atomic Battery to activate Data Store C; you can purchase one from the merchant Molly Jewitt to the west of the Slatten Dale entrance.
Once you're inside, you must power up the Central Processor. You can then head back out the way you came and open up Data Store C simply by pressing a button. From there, you must put an Atomic Battery into the slot to power up Data Store C and enable the buttons for the puzzle.
Data Store Charlie Store Room Puzzle Solution
It's pretty easy to solve the Atomfall Data Store C Store Room button puzzle once you know how it works. There are four server racks at the lowest level of Data Store C. Each server rack has a button on either side, and each of the buttons is numbered.
If you push buttons at random, you'll notice that the lights above the door may go on or off. It quickly becomes apparent that you need to push the buttons in the correct sequence in order to supply power to the door.

Here is the correct combination to open up the door to the Data Store C Store Room:
5 7 4 2
Push the above buttons in that exact order and the lock will power up. However, this only gives power to the lock; it doesn't actually open the door. You must then retrieve the Data Store C Store Room Key from the dead scientist to the right of the door and get inside.
So, what's inside the Data Store C Store Room? You can find a couple of healing items, a bit of lore, and a Training Stimulant in a Case, among other things. You'll need to power up Data Store C to fully unlock The Interchange (and eventually, the game's endings), so this little bit of extra loot certainly makes it worthwhile.
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