Once
proclaimed a "Wonder of the World", the worker city was an
engineering marvel. A fully self contained subterranean city complete with
buildings that doubled as a support for the ceiling some 20 stories above. The
artificial lighting allowed for a consistent ambience for the quarter of a
million people who would live here.
In preparation of building the
city, the underground river had to be diverted so the city could be built in the
basin it carved out. The river course was rerouted through a series of large
pipes, some which are used to provide water to the city above, some is used to
generate more electricity and the rest is returned to its original course. The
constant rumbling of the water through the pipes can be heard at all hours,
though most of the inhabitants became used to it rather quickly, not by choice
however. 
To arrive at the worker city large lifts had to be built. Originally these were used to send down the materials needed to build the city, but now they are used to transport to workers from their homes to the machine rooms.
In the early 2000s Joh Fredersen started to bring people in to occupy the worker city. The first to arrive were the indentured servants, the last were non violent criminals. they and their families were each assigned a number, and a job running the machines above until their dept was paid in full. Their jobs consisted of ten hours on the job 10 hours off, they are quite literally slaves to the machines and the system.
Except
during the shift change, the city is remarkably quiet, only the rumbling of the
water through the pipes can be heard. A large bell in the center square was
originally used to signal emergency warnings, now just sits there waiting to be
rung.
Overall, the crime is very low in the area. The workers lives are already difficult, they do not want any undue interference from the bosses in the upper city. Troublemakers, once found are quickly removed from the city, one way or another. Most are disposed of in the Catacombs. Vigilante justice is the rule of law