The largest data-center in Russia is located in Samara and owned by mobile telecommunications company MegaFon.
MegaFon erected a new building and didn't use any ready and abandoned constructions. The building has 5 floors and is moisture-proof.
All systems of the building are reserved. It has a transformer box, diesel driven generator, and a boiler-room.
Every hall of the building is supplied with hermetic doors. The data center has TIER III certificate which is the highest degree of reliability for civilian objects.
This is the best place where one can hide in case of some cataclysm.