Does anyone have any information about Kalarus caves in Kashmir?

A few hours ago I saw a documentary in Ajtak cable news channel that there is a cave in Kupwara district of Jammu & Kashmir of India, which people believe goes to Russia (which is 4000 kilometers away) because of the name Kala-Rus. There is one idle local dministrator there who has never conducted any search in that cave with excuses of shortness in manpower to conduct such search operation. In ancient times, in 5th century, this region was under the control of Hindu king Ranaditya. In "Rajtarangini", an ancient book of India, there is mention of Kalarus. There is a Hindu Temple there. And some adventurer, after going one or two kilometers, came back fearing loosing their life after loosing direction. Some say that there are cave paintings there on the inside walls or stones. Is there somebody who knows something about this place?