Sacred Haven of Debauchery

Or an intercity underground secret Ukrainian metro?

Yeah, just like the underground bunkers under McDonald's.

A minibus from one city to another for ten hryvnias?

A microbus (or a regular one) from Chernihiv to Kyiv (150 kilometers), then around the city by metro. From one terminal to another.
And 40 hryvnias, not 10!