15th-century shipwreck laden with treasure found

• Story Highlights
• Geologists on a search for diamonds off Namibia stumble on a shipwreck
  
• Ship loaded with gold coins, elephant tusks, copper and cannons
  
• Ship dates to late 1400s- early 1500s, heyday of de Gama and Columbus
  
• Archaeologist speculates: Was captain on official business, or was he a pirate?
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