Members of the Deep Submergence Unit aboard the Military Sealift Command fleet ocean tug USNS Sioux (T-ATF 171)

101027-N-8824M-050 
SAN DIEGO (Oct. 27, 2010) Members of the Deep Submergence Unit aboard the Military Sealift Command fleet ocean tug USNS Sioux (T-ATF 171) prepare to submerge a submarine rescue chamber during exercise CHILEMAR II. The exercise between the Chilean and U.S. Navy forces simulates submarine rescue operations. (U.S. Navy photo by Mass Communication Specialist 3rd Class Spencer Mickler/Released)

101027-N-8824M-050 
 SAN DIEGO (Oct. 27, 2010) Members of the Deep Submergence Unit aboard the Military Sealift Command fleet ocean tug USNS Sioux (T-ATF 171) prepare to submerge a submarine rescue chamber during exercise CHILEMAR II. The exercise between the Chilean and U.S. Navy forces simulates submarine rescue operations. (U.S. Navy photo by Mass Communication Specialist 3rd Class Spencer Mickler/Released)