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An X-ray of a concretion, front, a rocky mass that forms when metals such as gold and silver chemically react to salt water, is seen on a laptop computer at the Whydah pirate ship museum's warehouse in Brewster, Mass., Tuesday, Sept. 17, 2013. Undersea explorer Barry Clifford and his team took the season's final trip to the Whydah, the only authenticated pirate ship wreck in U.S. waters. (AP Photo/Stephan Savoia) ( Pirate Treasure )

In this Sept. 4, 2013 photo, explorer Barry Clifford shows, in Brewster, Mass., a concretion containing coins, some of the new treasure that was recently recovered around the wreck of the Whydah, a ship that sank during a ferocious storm off Cape Cod in 1717. Clifford doesn't sell Whydah treasures and said he would never sell the coins individually because he sees them as historical artifacts, not commodities. (AP Photo/Cape Cod Times, Merrily Cassidy) ( Pirate Treasure )

This September 2013 photo released by Barry Clifford shows a labeled X-ray image that reveals a pistol embedded in a concretion, some of the new treasure recently recovered around the wreck of the Whydah, a ship that sank during a ferocious storm off Cape Cod in 1717. Clifford located the Whydah site in 1984 and has since documented 200,000 artifacts, including gold, guns and even the leg of a young boy who took up with the crew. The Whydah is the only authenticated pirate ship wreck in U.S. waters. (AP Photo/Barry Clifford) ( Pirate Treasure )

In this Sept. 4, 2013 photo, explorer Barry Clifford, left, reviews an X-ray image of a concretion showing a cannon ball and coins that diver and conservator Chris Macort, right, had recorded in Brewster, Mass. The concretion is some of the new treasure recovered around the wreck of the Whydah, a pirate ship that sank during a ferocious storm off Cape Cod in 1717. Clifford located the Whydah site in 1984 and has since documented 200,000 artifacts. He only recently got indications there may be far more coins than the roughly 12,000 he's already documented. (AP Photo/Cape Cod Times, Merrily Cassidy) ( Pirate Treasure )

Chris Macort, a field archeologist working with the Whydah pirate ship museum, reaches down to check one of the ships cannons at the museum's warehouse in Brewster, Mass., Tuesday, Sept. 17, 2013. The Whydah sank in a brutal storm in 1717 with plunder from 50 ships. It was discovered in 1984. (AP Photo/Stephan Savoia) ( Pirate Treasure )

Underseas explorer Barry Clifford holds the barrel of a partially crushed blunderbuss he salvaged from the wreck of pirate ship "Whydah" during a video interview in Brewster, Mass., Tuesday, Sept. 17, 2013. (AP Photo/Stephan Savoia) ( Pirate Treasure )

This September 2013 photo released by Barry Clifford shows an X-ray image that reveals coins embedded in a concretion, some of the new treasure recently recovered around the wreck of the Whydah, a ship that sank during a ferocious storm off Cape Cod in 1717. (AP Photo/Barry Clifford) ( Pirate Treasure )

A tray holding lead shot, spoons, a metal syringe and the partially crushed barrel of a blunderbuss awaits processing at the Whydah pirate ship museum's warehouse in Brewster, Mass., Tuesday, Sept. 17, 2013. (AP Photo/Stephan Savoia) ( Pirate Treasure )