OK Sign A Navy diver gives the OK sign following his dive using the Office of Naval Research TechSolutions-sponsored MK29 Mixed Gas Rebreather system developed at the Naval Surface Warfare Center Panama City Division, Fla., April 4, 2018. The new system increases safety, accelerates the deployment of divers and conserves helium, a valuable natural resource. Navy photo by John F. Williams SHARE IMAGE: Download Image: Full Size (2.76 MB) Tags: Office of Naval Research, Rebreather Photo By: John Williams VIRIN: 180404-N-PO203-0299.JPG Photo Gallery