It can be reached along the “Adrenaline” tourist route, which starts from the “Divdyadovo” quarter of Shumen. Over the years, it has been the subject of vandalism. According to bat researchers, the largest bat colony is located there and 5 species of winged mammals are found there. The floor is covered with a thick layer of guano. In the past, it served as a prison for guilty Turks. Among Shumen residents, there is an opinion that the “Divdyadovo dungeon” is an exit from the “Biserna” cave, but experts categorically deny such a connection. From the entrance, a wonderful view of the surroundings of Shumen opens.
