Arrr! Explorer hot on trail of more sunken pirate treasure off Mass. coast

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Pirate Treasure
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Pirate Treasure
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)