U.S. Navy Chief Navy Diver Kevin Chinn performs a training dive off the pier of the Mobile Diving and Salvage Unit (MDSU) 1 compound at Joint Base Pearl Harbor-Hickam, Hi., Sept. 27, 2011.
MDSU-1 mission is to deploy combat-ready, expeditionary warfare capable, specialized dive teams to conduct harbor and waterway clearance, emergent underwater repairs, and salvage operations in all environments. (DoD photo by Mass Communication Specialist 2nd Class Mark Logico, U.S. Navy/Released). Original public domain image from Flickr