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The secret at the bottom of the oldest lake in Europe

In the heart of Northern Macedonia, in the small city of Ohrid, two families have been guarding the town's secret for generations. Home to Europe's oldest lake and the renowned Ohrid pearl, worn by both Queen Elizabeth II and the late Princess Diana, the town's pearl-making tradition remains a well-known and well-kept secret, and one which they swear they'll take to their grave.

Video by Martina Žoldoš