200513-N-AP176-1009 ATLANTIC OCEAN (May 13, 2020) A Navy diver assigned to Mobile Diving and Salvage Unit (MDSU) 2 dons a KM37 surface supplied diving helmet before conducting a dive from the Military Sealift Command fleet ocean tug USNS Apache (T-ATF 172). (U.S. Navy photo by Chief Mass Communication Specialist Jeff Atherton/Released)