Sinkhole near the village Gurbuki Karabudahkenskogo district of Dagestan. As it turned out, the pit was formed long ago. With the help of a rope was used to measure the approximate depth of the hole, got about 30 meters.
Later in this funnel was rescued girl. According to her testimony of her "strangled" and threw own husband. Moving to the top, one of the adventurers were told up-to-date phrase, "Yes, at the top in this world even worse."