Hell. Shock. The horror. Nightmare. Huge failure of the mine where the accident occurred in November 2014 and it began to sink - video made in Russia in the Urals city of Perm Krai Solikamsk. the depth of the crater more than 100 meters. The video shows the gradual collapse of the sides and the subsequent explosion. Near people live. The picture is taken with a flying robot - clearly visible scale of the crater and its depth.