In 1864, the Confederacy's H. L. Hunley sank the Union warship USS Housatonic, becoming the world's first successful submarine. Moments after the attack, it disappeared mysteriously into the depths of the sea. Lost for more than a century, it was found in 1995 off the coast of Sullivan's Island and raised in 2000. The Hunley is now being preserved and excavated in a 90,000-gallon tank, which you can see during an informative tour guide. A newly renovated
exhibit area includes artifacts excavated from the sub and interactive displays.