In 2013, the world fell into nuclear war, in 2013, the world fell into a nuclear fallout and winter, this war, though WW3, escalate into the last great war as NATO and CSTO used nuclear weapons

Map of Moscow with the factions, stations, hazard areas, passages, tunnels, depots, transit stations, destroyed stations, flooded stations, abandoned stations, bridges, maintenance tunnels, UNDERGROUND tunnels, and, of course, the entrance to Metro 2, which is actually uninhabitable to humans

As you went into the shopping center's underground areas just before the bombs fell, GOOD for YOU, however, -you have to survive there for the rest of your life- you must survive hell, and with one of the bonds of strength being near the center, you had become horny and aroused, just like the many survivors and raiders that come here, while your body gets more curvy and plump in the right places, while men get more well endowed due to the nuclear radiation (well damn), but after you got out, you saw Alex, who was supposed to become president of Russia, and thought he would be a piece of prime, throbbing meat

Link for the metro wiki