The wreck of a Spanish galleon, the San José, is thought to hold a cargo of gold, silver and emeralds worth $18 billion dollars. It’s laid on the seabed off the coast of Colombia for more than 300 years, after being sunk by the British. Decades after it was discovered, a debate still rages among various groups who think they have the right to retrieve the San José’s long lost cargo.

On today's episode, Lucy Hockings speaks to marine archaeologist Dr Rodrigo Pacheco-Ruiz and our business correspondent Gideon Long to find out who’s claim to the wreck is strongest.

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Producers: Richard Moran and Beth Timmins

Sound engineer: Mike Regaard and Ben Andrews

Assistant editor: Sergi Forcada Freixas

Senior news editor: Sara Wadeson