A 511th Engineer Dive Detachment Soldier secures his diving helmet during a dive supervisor qualification training scenario at Joint Base Langley-Eustis, Virginia, Aug. 22, 2018. One of the training scenarios entailed a dive team member’s leg being trapped between metal, and the standby diver started experiencing numbness in the face. (U.S. Air Force photo y Senior Airman Tristan Biese)