Mobile Diving & Salvage Unit One (MDSU-1) Mission Statement: To provide swift and mobile ship salvage, towing, battle damage repair, deep ocean recovery, harbor clearance and underwater ship repair capabilities in support of the Third and Seventh Fleets. Mobile Diving & Salvage Unit ONE (MDSU-1) was first commissioned as Harbor Clearance Unit ONE in February 1966 in Subic Bay, Republic of the Philippines. The command was immediately deployed in Vietnam where salvage teams conducted numerous harbor clearance operations in rivers, harbors and coastal areas. HCU-1's professionalism resulted in the command being awarded the Meritorious Unit Commendation and Navy Unit Citation. After relocation to Pearl Harbor, Hawaii, in 1979 the unit's mission was expanded to include providing diving services to all Pearl Harbor based surface ships – and in January 1982 the unit's name was changed from Harbor Clearance Unit ONE to Mobile Diving & Salvage Unit ONE to better reflect its capabilities. In 1996 MDSU-1's mission was further expanded with the consolidation of the SUBASE dive locker into MDSU-1's Fleet Maintenance Dive Department (FMDD), making MDSU-1 responsible for providing all ships husbandry diving services for surface ships and submarines in Pearl Harbor. MDSU-1 utilizes a diverse range of surface supplied diving and recompression chamber systems to accomplish its mission, including a mixed-gas diving system (FMGS) capable of supporting dives to a depth of 300 feet. The unit's equipment is air transportable, giving MDSU-1 the ability to respond to diving and salvage missions anywhere within CINCPACFLT area of responsibility. Recovery of the Ehime Maru After months of pre-planning, in August 2001, MDSU-1 divers began specialized training for the recovery of the missing crew-members of the Ehime Maru fishing vessel, sunk after an unfortunate collision with the submarine USS Greenville earlier in the year. MDSU-1 divers face the difficult task of penetrating the wreck, after it has been moved to shallower waters, to recover the nine missing crew-members and the belongings of both victims and survivors. The divers will then remove key parts of the Ehime Maru for a memorial, pump the fuel oil from the vessel, and then seal the hatches before it is taken out and laid to rest in deep waters. Almost sixty MDSU-1, EOD and USS Salvor divers are involved in this sensitive operation, supported by deep ROV assets from NAVSEA Supervisor of Salvage.