Col. Michael Richards and Staff Sgt. Maribel Cortez communicate with patients undergoing treatment in the multiplace hyperbaric chamber at the Wilford Hall Ambulatory Surgical Center, Joint Base San Antonio-Lackland, Nov. 18, 2015. Patients are closely monitored during each dive by technicians and doctors, both inside and out of the chamber, to ensure patient safety at all times. Richards is the 59th Hyperbaric Medicine Flight commander; Cortez is a hyperbaric medical technician. (U.S. Air Force photo by Tech. Sgt. Christopher Carwile)