A giant depres­sion that formed on the Yamal Penin­su­la between 2013 and 2014. It is a huge fun­nel in the ground with a diam­e­ter of 20 meters and a depth of 50 meters, which is com­pa­ra­ble in height to a 16-sto­ry build­ing. Some sci­en­tists believe that this is the first cry­o­vol­cano dis­cov­ered on Earth. Water, ammo­nia and methane erupt from the depths of such for­ma­tions.