In 1864, the Confederate submarine H.L Hunley was the first submersible boat to successfully attack and sink an enemy ship under water with the use of a torpedo. For reasons still unknown, the Hunley disappeared after the attack until it was found in 1995. USGS scientists were asked to provide H.L. Hunley archeologists with geological information which was needed to reveal the stratigraphic structure around the wreck site and to better understand the submarine's burial sequence. Side-scan

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... Chirp and3.5-kHz seismic data, and 20'sediment cores were collected to map the stratigraphic structure. This information was necessary for planning and engineering purposes, which ultimately led to a successful raising of the H.