Sea gives up secrets to experts

With shafts of sunlight shimmering through a few metres of crystal clear water, you can pick out the cornerstones of an ancient civilisation which inspired literature and legend.

There is more than a whiff of Atlantis about the story of Pavlopetri - the world's oldest submerged town.

But the Bronze Age site, off the coast of Laconia in Greece, has its roots in fact not fiction.

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