The work in the unbreathable atmosphere is one of the most physically intensive and the dangerous cleaning activities. Workers wear breathing apparatus or respirators during the cleaning process. Using of the respirators is necessary because of the oxygen absence (dead-air spaces), the existence of toxins in air or the excess of air-born dust elements in the cleaned area. There are used the anti explosive sorts of technical equipments in the explosive areas.
It mostly concerns the specialised supporting manipulation activities with the technical equipment under water – suction nozzle, sludge pumps, etc.