Sinkhole

09.08.2006
Residents of Novoselovo district in the Krasnoyarsk region have come across a mysterious phenomenon in the field. They discovered several tunnels of unknown origin in an area located some 100 meters away from the highway connecting the cities of Krasnoyarsk and Abakan , in the vicinity of the village of Kurgany, Siberian News Agency reports. There are about 10 holes in the field. Each hole has an entrance to a cave-like hollow place in the earth. Some of the tunnels are big enough for a person of medium height to stand up straight. Local residents have a number of theories to explain the origin of the tunnels. Some people believe the tunnels are the work of unidentified pranksters, others blame mysterious animals which reportedly dig holes in the ground.

http://english.pravda.ru/science/earth/09-08-2006/83834-holes-0/