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Michael Le Quesne, 16, was swimming off a popular beach in Montenegro with his parents and his ten-year-old sister Teodora when he spotted an odd looking 'stone' at a depth of around two metres.
It turned out to be a large, submerged building which may have been the centrepiece of an important Greek or Roman trading post, swallowed up by the sea during a massive earthquake.
Mr Le Quesne, an archaeology expert and author on the subject, said: “If it is a monumental building it is not going to be part of a small hamlet, but it is not a missing Atlantis, as we would already know about it. It remains a bit of a mystery.”