Going down at the dawn and not seeing the sun for days. Narrow galleries, weak small lamps and the constant echoes of the drilling. Miners’ life was not easy at all. Equipment: lamp helmet to move in the dark and pneumatic drill. To make sure of re-emerge, a firedamp detector to control the odorless explosive gas which is usual in the coal and sulfur mines: the firedamp, the anemometer which ensured the air presence and a scintillator to check the radioactivity level.