The central stage is filled with grottoes. They have a separate tour. They are the system of water supply to the fountains on a complex system of water drainage from the upper storage ponds. In addition, the central ceremonial grotto was the exit from the palace. There was a table with fruit in it, and when a person extended his hand to the basket, the fountains of the crackers were turned on, and so did the exit from the grottoes - the veil fountains were turned on. All these were ruled by a specially trained person. By order of Peter, no one had to leave the garrot dry. Translated with Google Translate