s in Yagodinska cave The exploration of the cave commenced in 1963 by the Speleological Club of
Chepelare, led by Dimitar Raychev. Initially 8,500 m was explored, and 2,000 m more galleries were discovered during the second mapping of the cave in 1982-1986. The age of the cave is estimated at 275,000 years. Yagodinska Cave is 10,500 m long and has three levels, of which a 1,100 m path in the lowest level was electrified in 1971–1982 and opened for tourists. The entrance and the exit for that level are artificial tunnels with lengths of 150 and 80 m respectively. The altitudes of the entrance and the exit are 930 m and 937 m respectively. The temperature in the
show cave is constant all year round at 6ºС; the humidity is 85%–91%. Yagodinska contains a very large number of cave formations, or
speleothems, including
stalactites,
stalagmites,
stalagnates,
flowstone, draperies and
cave pearls. The natural entrance leads to the uppermost level, where an ancient dwelling dated to the 4th millennium BC was discovered. Excavations have shown that the dwelling was an important centre for producing ceramics. The clay was extracted from the interior of the cave and from the bed of the Boynovska River, and the pottery was baked in clay furnaces. The inhabitants abandoned the site as a result of a collapse caused by an earthquake. == Fauna ==