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This image provided by the National Oceanic and Atmospheric Administration shows a view of the USS Hatteras as it fought and sank in 1863, depicted in a drawing by Civil War artist Francis H. Schell, above a 2012 high-resolution 3-D sonar image from the National Oceanic and Atmospheric Administration. A team of archaeologists and technicians spent two days in September 2012 mapping the wreckage of the USS Hatteras, the only U.S. Navy ship sunk in the Gulf of Mexico during Civil War combat. (AP Photo/NOAA, Northwest Hydro Inc., James Glaeser)

Associated Press
This image provided by the National Oceanic and Atmospheric Administration shows a view of the USS Hatteras as it fought and sank in 1863, depicted in a drawing by Civil War artist Francis H. Schell, above a 2012 high-resolution 3-D sonar image from the National Oceanic and Atmospheric Administration. A team of archaeologists and technicians spent two days in September 2012 mapping the wreckage of the USS Hatteras, the only U.S. Navy ship sunk in the Gulf of Mexico during Civil War combat. (AP Photo/NOAA, Northwest Hydro Inc., James Glaeser)
This image provided by the National Oceanic and Atmospheric Administration shows a view of the USS Hatteras as it fought and sank in 1863, depicted in a drawing by Civil War artist Francis H. Schell, above a 2012 high-resolution 3-D sonar image from the National Oceanic and Atmospheric Administration. A team of archaeologists and technicians spent two days in September 2012 mapping the wreckage of the USS Hatteras, the only U.S. Navy ship sunk in the Gulf of Mexico during Civil War combat. (AP Photo/NOAA, Northwest Hydro Inc., James Glaeser)
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