Underground Nightmare

It is a dumping ground for serial killers, a haven for criminals on the run, and a lair for ancient evils beyond human comprehension. There is a dark and terrifying underground world buried under the city, which includes several subway lines that had to be abandoned due to the economic depression decades ago, sewers that are no longer in use, and air-raid shelters connected to each other. No one knows how many dirty and unknown crimes are hidden in the world below, but the occasional cases always make people fall into great panic.