Sunken Egyptian treasures on show at the British Museum

They’re the secrets of ancient Egypt which for thousands of years lay submerged beneath the Mediterranean. The treasures belong to two sunken cities which were thought to be the stuff of myth. Now the artifacts dredged up from the ruins of the lost cities of Thonis-Heracleion and Canopus go on show for the first time at the British Museum. Here’s our Arts correspondent, Brenda Emmanus.