Coast: Caves and Coves

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The team explores the caves and coves to be found on Britain's coastline. Nick Crane follows in the footsteps of the Victorians as he seeks out sea caves in Jersey that took nerves of steel to reach, and Ian McMillan is on Scotland's Ayrshire coast where he delves into the story of Sawney Bean, asking whether this cave-dwelling cannibal was simply the product of a wild imagination. Andy Torbet travels to the Shetland Isles to carry out a 3D survey of Britain's longest sea cave, and Helen Arney meets scientists in a mineral mine off the Cleveland coast who are searching for holy grail of physics - dark matter. Last in the series.

Hosti: Nick Crane, Helen Arney