It will be useful to know about the place where you go
Guryevskie quarries, or Byakovskie quarries— They are three separate systems of underground passages on the bank of the river Osetr. Approximately in the XV-XVI centuries limestone was mined by bottomhole method. Limestone was of poor quality, and so a century later extraction was stopped.
The total length of all cave passages ranges from 90 to 120 km. At the entrance to the caves there is a log, where every descending person is to check-in, and when they leave they have to check-out. There are many camping sites on the territory where you can spend the night. It is not recommended to go down the caves