View of south end of Cape Island in Cape Romain National Wildlife Refuge in South Carolina. The remains of the Civil War-era steamer Planter are located within sight of an 1857 lighthouse.
Robert Smalls, who piloted the Planter to freedom during the Civil War.
The Planter illustrated after the 1862 escape from Charleston Harbor. Robert Smalls and his crew turned the ship over to the U.S. Navy.
Cape Island in Cape Romain National Wildlife Refuge, site of the probable location of the Planter's wreckage.
Researchers used magnetic instruments to survey the seafloor where they suspected the wreck might be. The probes indicated a concentration of iron below the seabed.
A map of the potential wreck site of the Planter.
An archaeologist with a sonar unit during the search for the Planter shipwreck.
The USS Keokuk sinks after bombardment by Confederate shells in 1863, with Robert Smalls piloting.
Stephanie Pappas, Live Science Contributor
Stephanie interned as a science writer at Stanford University Medical School, and also interned at ScienceNow magazine and the Santa Cruz Sentinel. She has a bachelor's degree in psychology from the University of South Carolina and a graduate certificate in science writing from the University of California, Santa Cruz.