Now through the crater you can enter your own, yet small, but already cozy apartment 

You get access to the apartment and its improvement along with access to the metro, on the first level of the business. From now on you can also check the furniture store via the same metro. Wanna regularly see some new merchandise there? Continue to grow your business in the crater. Oh, apartments of other players can also be visited, by the way

To join other survivors in Sector 7 and together explore locations around crater, you have to reach level 100 and complete a special quest.