On Jan. 11, 1863, a Union warship was sunk in a skirmish with a Confederate vessel in the Gulf of Mexico.
Exactly 150 years later, a new 3-D map of the USS Hatteras has been released that shows what the remains of the warship look like.
The Hatteras rests on the ocean floor about 20 miles (32 kilometers) off Galveston, Texas, according to a release from the National Oceanographic and Atmospheric Administration, which helped to sponsor the expedition to map the shipwreck.
The Hatteras was sunk in a battle with the Confederate raider CSS Alabama, and was the only Union warship sunk in combat in the Gulf of Mexico during the Civil War.
"Most shipwreck survey maps are two-dimensional and based on observations made by sight, photographs or by feeling around in murky water while stretching a measuring tape," said James Delgado, with NOAA's Office of National Marine Sanctuaries, in the statement.