He and his
crew of marine experts and NUMA
volunteers have discovered more than 60 historically significant underwater wreck sites including the first submarine to sink a ship in battle, the Confederacy's Hunley, and its victim, the Union «sHousatonic; the U-20, the U-boat that sank the Lusitania; the Cumberland, which was sunk by the famous ironclad, Merrimack; the renowned Confederate raider Florida; the Navy airship, Akron, the Republic of Texas Navy warship, Zavala,
found under a parking lot in Galveston, and the Carpathia, which sank almost six years to - the - day after plucking Titanic's survivors from the sea.