The Port Royal Sound, located off the coast of Hilton Head Island in Beaufort County, South Carolina, has been a site of maritime activity for centuries, and has a rich history of shipwrecks, piracy, and treasure hunting. Here are some of the treasures that have been found or are rumored to be hidden in the Port Royal Sound:

• Shipwrecks: The waters around the Port Royal Sound are home to numerous shipwrecks, many of which are hundreds of years old. These wrecks have yielded a wide range of treasures, including gold and silver coins, jewelry, and artifacts from the colonial era.
• Pirates' loot: The area around the Port Royal Sound was a popular haunt of pirates, who would prey on ships passing through the area. Legends abound of pirates hiding their treasure in the local marshes and islands, and many treasure hunters have spent years searching for these fabled riches.
• Civil War relics: The Port Royal Sound was the site of significant naval activity during the American Civil War, with numerous battles fought in and around the area. As a result, the waters around the sound are home to a large number of Civil War-era relics, including cannonballs, weapons, and other artifacts.
• Fossils: The area around the Port Royal Sound is rich in fossils, particularly from the Miocene epoch, which lasted from about 23 to 5 million years ago. Fossils of prehistoric sharks, whales, and other marine creatures have been found in the sound and along the nearby beaches.

While many of these treasures have already been discovered, there are likely still many more waiting to be found in the waters and marshes around the Port Royal Sound. However, it's important to note that any treasure hunting should be done in accordance with local laws and regulations, and with respect for the area's natural and historical resources.