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Hallway is a secret dark map with physical sightings of Mörkö. The tunnel itself is a long hallway, with disturbing sounds and breathing that gradually gets louder.
This area is accessible by opening door B2 in the Bergmann tunnels, which in itself is quite a task. The door guarding B2 can be unlocked by a key found underneath a can on the east side of the tunnels, right before the action sequence involving the gates. Furthermore a fuse from the break area's storage room must be taken there and plugged in to power a keypad with the code 4027. Upon entering the pitch black hallway, Mark will encounter strange phenomenon. The flashlight isn't effective due to a heavy dark fog around the whole area. Upon reaching the end of the hall, the exit will be locked, and Mark will be ambushed by Mörkö, who places Mark in a storage closet in tunnel3, skipping the Pinefell Water Treatment Plant entirely.
- Depending on how fast/slow Mark is on navigating the hallway, he may be ambushed earlier than the end of the door, the result however, is the same.
- Mörkö itself is photographable, yet yields no comment from Mark, and also makes it the one picture in the game impossible to photograph all spots.