20160303-N-LB724-074 PENSACOLA, Fla. (Mar. 03, 2016)-- Republic of Korea Navy Vice Adm. Jin-Sup Jung listens to Hospital Corpsman 1st Class Walter J. Bedell describe the training Sailors and Marines must complete at the Naval Survival Training Institute's Aircrew Water Survival pool. The multi-place underwater egress training, or helo dunker, simulates an aircraft ditching in a body of water and sinking upside-down, allowing aircrew to practice escaping from a submerged fuselage. (U.S. Navy Photo by Ensign James A. Griffin/Released)