After the nuclear holocaust the humanity is extinct. Only few survivors found a shelter in the Moscow subway system. About 100 stations became each one a city-state,with their own ideology, alliances and wars. In the dark tunnel terrible forces are mortifying the humans. On the surface mutants took over. A peripheral station suffers an invasion of horrible black beings. 24 years old Artiom, a citizen of this station, has the mission to take the information about this invasion to the central stations, where lies the political power of the dying human civilization. Artiom has to cross over hostile stations and deadly tunnels. At the end he manages to get the message and helps to destroy the source of the black beings. But at the end he realizes that all this was a terrible mistake.