takes place in the city of Moscow, Russia 20 years after a global nuclear holocaust in 2013.

Moscow has become a wasteland filled with killer mutants and irradiated air and is uninhabitable for humans without protective gear.

The surviving population now lives in the Moscow Metro, which is described as a labyrinth of railways, tunnels, and bunkers.

On the surface, the city is desolate, air and water are contaminated with radiation, and nearly everything is covered in ice and snow.