Open Box Hollis Mod-1 Scuba Breathing PodKnown simply as the MOD 1, the patented Kirby Morgan two chamber (Mask and POD) design opens up a myriad of configuration possibilities with both Open Circuit systems and Closed Circuit Rebreather systems. > Used by United States Marines Combat Divers and Military Dive Teams around the world, Professional Underwater Videography Teams and Scientific Dive Teams, the Kirby > Morgan Modular Full Face Mask represents a giant step up in safety, versatility