Finding an Access Key in Marathon feels like a win until you realize the game does not tell you what to do with it or where it actually works. It is the kind of item that sits in your inventory while you check every door and terminal you walk past.
This guide covers the exact location where you can use the Access Key so you are not wandering around a live map trying to figure it out the hard way.
Location Of Where To Use The Access Key
To make use of the Access Key, head on over to the North Relay area of Perimeter. Specifically, you want to go to the area which I have marked on the map below.

Upon getting there, you will find a red laptop lying on top of some crates. Getting close to this laptop will reveal that it needs an Access Key. Use your Access Key here to unlock it. If you are having trouble finding this laptop then refer to the video below.
That’s it!
And that is everything you need to know about the Access Key. What seems like a cryptic item with no clear purpose turns out to be a straightforward interaction. The game just does a poor job of pointing you toward it.
Marathon has a handful of items like this that never get properly explained. So if you are still working through other confusing quests or contracts, then check out some of my other Marathon guides for help!

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