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The unique properties of the Black Sea make it an archaeologist’s dream but an ecologist’s nightmare. Most of its water is almost devoid of life, so medieval shipwrecks are perfectly preserved. But wildlife is under threat. On his journey across the sea, presenter Tim Whewell dives under the waves to explore its layers of history – and layers of life and death. He joins marine archaeologists investigating the secrets of a prehistoric settlement and meets the biologists counting dolphins. They say growing political tensions are blocking vital conservation efforts.

Producer Monica Whitlock

Photo: The stern of an Ottoman shipwreck discovered under water Credit: Black Sea Maritime Archaeology Project (MAP)