Biological and chemical weapons have turned the surface of the planet into a zone completely unsuitable for habitation, into a deadly attraction. The remnants of humanity eke out a miserable existence underground. Only a few teams of search engines, risking their lives every second, make forays to the top. Not everyone returns back to the Underground. Thousands of bloodthirsty monsters roam the streets of destroyed cities. Harpies look for prey from the skies. Huge “snow people” set up ingenious traps. Hordes of zombies lie in wait at every turn. And at night even more disgusting creatures come out to hunt.