Factory atmosphere, drone in a mine tunnel: Listen & Download Drone in a mine tunnel, Factory atmosphere .mp3 Error! Change your browser, please! ⇓ Download Robotic assembly line ⚠ Compressor industry ⚠ Lithographic press ⚠ Power station turbine ⚠ Hydraulic pump ⚠ Grind metal on a grinding machine in a ⚠ Forklift drives by ⚠ Postal sorting line ⚠ Electric welding ⚠ Welding transformer, turning on, working, ⚠ Power Plant Water Pumps ⚠ Factory work, general noise ⚠ ★★★★★