Atom Fall There is a very open game, which gives you the freedom to discover at your own rate. There are locked doors and various keys everywhere on which you can raise your hands. The more you get, the more you have the opportunity to find the secrets of the world.

Relevant
Atom Fall: Interchange Guide
The exchange is at the center of the mystery of the Atom Fall.
The keys you get in the game have a concrete shelter key, but it is unclear what you unlock. You will need to know what the key is for, and it is a smart thing to do as soon as possible.
How to get a concrete shelter key
In the first hour of the game you will find the key to the concrete shelter. You will be told Go and see Molly Some information related to exchange and trade of some items.
She is carrying different items, but She also stocks the concrete shelter key To trade for you. She is in a broken house, in the northern part of the Slane Dell. Talk to her to trade for her.
What unlocks the key to the concrete shelter
The key detail states that it opens the door to a bunker around the opening area of ​​the atom fell. Thankfully, the location is Molly where not much.
If you Jump to the west from Molly’s positionOn top of a hill toward the large broken bridge, You will find a bunker on your right. This is the door that opens the key to the concrete shelter, and it gives you access to the maze of sewage tunnels that will be really useful when developing through the story.
If you find shelter before receiving the concrete shelter key, you will find a note on the left side of the door, telling you that you can get the key for “reasonable price” from Molly.
The atom falls will be one of the many keys you receive when playing, and once you use it to open the bunker, it will remain in your inventory.

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Atom Fall: Bunker Location Guide
Bunkers hide useful gear and training serums in the atom fell, but they are often well hidden.