190109-M-YY851-1002 OKINAWA, Japan (Jan. 9, 2019) Navy Diver 1st Class Will Crampton, right, assigned to 3rd Reconnaissance Battalion, III Marine Expeditionary Force, gives a safety brief prior to Marines entering a standard Navy double lock hyperbaric recompression chamber at Camp Schwab, Okinawa, Japan, Jan. 9, 2019. The chamber is used in a training scenario to simulate the pressure felt when diving up to 60 feet in order to enhance the Marines combat readiness. (U.S. Marine Corps photo by Lance Cpl. Hannah Hall/Released)