The Spanish galleon San José was overloaded with 200 passengers and 700 tons of cargo on a summer night in 1631 when it smashed into a rock off the Pacific coast of Panama, spilling silver coins and bars into the Gulf of Panama. More than 400,000 coins and at least 1,417 bars were lost over a 40-mile trail. Four hundred years later, that shipwreck has become one of the latest to land in a legal quagmire over who should have the rights to historic artifacts trapped under the sea. This one involves the United Nations, the United States Department of...