An ascending cave in marble near Kosovo village in the locality Dalbokoto Dere.
The first recorded visit was made by cavers from Plovdiv, led by At. Siderov, in 1961. The cave was explored and surveyed first in 1962 by cavers from the Second International Caving Expedition and by Polish cavers. A complete map of the cave was prepared in the period August 9-19, 1983 by cavers from Akademik Plovdiv Caving Club, led by Iv. Petrow.
The cave is used for drinking water supply. A permit is requested from the Water Supply and Sewerage in Kosovo village to enter the cave.