The tunnel itself leads to warehouse 36 and is an alternative route to this building.
This chapter explains how to solve the trapdoor puzzle to get there.
When you are in a room with a flap, a total of 3 items are to be found.
The second item isRatchet gear- you’ll find it next to the lever, behind a damaged wagon.
Interact with it and assemble the acquired parts in the following order: lever, cogwheel, ratchet unit.
Now activate the mechanism to initiate the floor passage, which will unlock after a while.
Now the mysterious passage will be opened.
you’re free to go downstairs and then enter a room full of gas.
For this, you will receive the achievement ofThe Delusional Detective.
After a short walk you will reach the interior of warehouse 36.
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