Special issue of the newsreel "Geologists". Types of minerals: coal, granite. The work of the geophysical party of the USSR Ministry of Geology, headed by G. A. Zasypkin in the Rostov region. Conducting subsurface research using gas-dynamic installations. View of a gas-dynamic unit mounted on a truck. Remote Control. Animation and announcer's text reveal the principle of operation of the gas-dynamic installation. Geologists at the field camp.