The longest cave in Khakassia, which was discovered by speleologists from Tomsk in 1981. The length of the underground passages reaches 11 km, and the depth is 870 m. Thanks to the findings of archaeologists, there is a version that the cave was a temple of ancient people. Inside there are hundreds of lakes with crystal clear water. Emerald Lake is considered especially beautiful. Speleologists like the large halls, multi-level galleries, bizarre dripstone formations, graceful grottoes, wells, steep descents and ascents. A large population of bats lives underground.