Air Force Airman 1st Class Troy Moncrief, a 354th Civil Engineering Squadron wastewater apprentice, washes the walls of a indoor settling pond underground at the Eielson Air Force Base, Alaska, wastewater treatment plant July 14, 2016. Most of the plant is underground, guarding the mission-critical process from weather that can drop to 50 degrees below zero in interior Alaska. ( Air Force photo by Staff Sgt. Shawn Nickel)

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