A US firm hauled up hundreds of thousands of gold and silver coins from a sunken Spanish frigate, then Spain fought through the courts and won back the estimated $500-million haul

A notable judgment that influenced the protection of underwater cultural heritage initially began as one of the largest treasure recoveries in modern history. In 2007, the Florida-based salvage company Odyssey Marine Exploration secretly recovered around 500,000 gold and silver coins from a shipwreck in the Atlantic Ocean under the codename Black Swan.

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