KEMEROVO, April 21 (Itar-Tass) - At least of 13 people remain under the debris of the Zarechnaya mine in the Kemerovo region, the mine’s sources told Itar-Tass.

“Now the work is underway to clear the debris. Rescuers and specialists are drilling about 8-10 metres to the area where people are staying now,” the sources said.