“More air! Quick.” The voice echoes from the black hole below. Illegal gold miner Ependi, 28, grabs the hose and pumps three empty ice bags full of compressed air. He ties the neck of each one with a plastic tie, and straps them to the rope on the homemade pulley system, which is just an old wheelbarrow wheel and 125cc bike motor, and sends them 50m down the shaft below. For the three illegal gold miners working down there, this pulley system is their lifeline.