NORTH CHARLESTON, S.C. ó It could be one of the nation’s oldest cold case files: What happened to eight Confederate sailors aboard the HL Hunley after it became the first submarine in history to sink an enemy warship? Its fate has been the subject of almost 150 years of conjecture and almost a decade of scientific research since the Hunley was raised back in 2000. But the submarine has been agonizingly slow surrendering her secrets.

View an audio slideshow on scientists studying the submarine – Click Here.