The Górniczy Agregat Gaśniczy (GAG) is a jet engine inertisation unit developed for use in mines, controlling and suppressing coal seam fires and neutralising firedamp situations. The unit was designed in Poland in the 1970s, its name roughly translates as "Mine Fire Suppression Apparatus".[1][2] A GAG 3A unit was developed by the Queensland Mines Rescue Service, in association with the Commonwealth Scientific and Industrial Research Organisation (CSIRO).[3] GAG units have been used in Australia since 1998.[2]