Metro is the main hub of the Aironkru people. It is a fortified building inside the Zone where there is a passage to belowground. This building is in constantly repair and optimization.
The tunnels below still have housings and storages, but after the Red Days, the people prefer to avoid the tunnels. Many tunnels have collapsed and some monsters and horrors roams in them.
This community has three main Bosses that run the place. These three people are the faces of their respective clans. Clans in Metro are not bound by blood or family, but by affiliation and creed.