This morning, an unusual lesson took place in Kazan township of Derbyshki at the Lake Komsomolskoe. Rescuers of search and rescue squad of the Civil Defense Department of the city of Kazan and representatives of “Rescuing on the Water Association of the Republic of Tatarstan” regional organization invited students of the secondary school No. 101 and high school No. 19 to a master-class on rescuing people on the ice. Professional rescuer, Denis Konov, played the role of a fisherman, who become the first victims of thin ice.