Meanwhile, an ongoing battle was to dewater the Quecreek Mine to allow rescue operations to be planned. Millions of gallons of water had to be pumped from the flooded coal mines as the water level needed to be lowered to prevent the loss of the air pocket in the mine area where the nine miners would congregate. Should a rescue hole penetrate the mine, the air pocket could escape and the air filled void area become flooded, and the miners would drown. The second grave concern was the quality of the air in the mine. Pumps were set up as they became available.