Senior Airman Christopher Lemming, 9th Civil Engineer Squadron water and fuels systems maintenance, descends into an underground water tank during a training exercise at Beale Air Force Base, California, April 27, 2017. During confined space entry, every team member plays a specific role from an attendant to oxygen monitor, which helps ensure efficient entry of the confined space. (U.S. Air Force photo by Airman 1st Class Justin Parsons/Released)
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