This small dying world is a precise copy of the past big world. Each station became a country, with its government, army, borders and many other things from the past. What’s present is a very heavy psychological atmosphere: small children who will never see sky, old people who still remember the PAST times, and young men and women who fight for their world, for their children. Some people inside the metro still remember happy years before THAT DAY and they still believe that one day they will return up to the surface.
These people are the last representatives of mankind - human cycle of evolution nears its end, new species (very ugly) appear on the surface of the Earth and deep inside of metro. They have been living in metro of a big ex-USSR city – Moscow, for 20 terrible years. Horrible Post-Apocalyptic world of 40000 people.