Rare look at Egypt's sunken cities
3 June 2016 Last updated at 00:30 BST
More than twelve centuries ago, two Greco-Egyptian cities sank into the Nile Delta off the coast of Egypt.
Now, thanks to underwater excavation, the public has the chance to see some amazingly well-preserved objects.
Dan Damon talked to Aurelia Masson-Berghoff, the curator of a new exhibition at the British Museum in London.
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