The Machine
The Machine is an unknown entity referred to only by the name "The Machine". It is apparently tied to Mörkö, or may even be it. It is apparently a kind of "underground god". The Machine was created by Andrew Herts. This information came from a cave, hidden behind some trees and bushes behind the Pine Fell Water Plant in tunnel2.
In Bunker, there is a computer with a code, and that code when decoded produces part of the text "Homeless People (made the) machine". However, we see here that Andrew Herts made the machine. So the only logical explanation would be that the machine was made of homeless people. This could coincide with the mushrooms/blue mushrooms (aka "ugu shrooms"), possibly mutating the said people and assimilating them into The Machine.
Here is the original photo:
And here is it with some image cleaning applied:
It says:
Anderw Herts made the machine, that became a legend in stalburg - a creature once known as the god of the underground, ?????.
Machine runs on ??????? sand, rocks, water, ???????
He created the machine because ????? to "save the poor people".
????????????????????????
Men in ??? project ? and seek ingredients, especially ?(looks like "poom").
people ???? a gift from the ????.
Feel free to investigate!