3/12. Severn Estuary to Aberystwyth. For thousands of years, the world's second greatest tidal range has had a huge impact on the inhabitants of the South Wales coast. Neil Oliver uncovers real-life horror at the Smalls Lighthouse, Mark Horton explores the power of sand, Alice Roberts seeks out our pre-ice age ancestor and Miranda Krestovnikoff reveals the secrets of rockpools. Plus the dramatic natural spectacle of the Severn Bore. Nicholas Crane hosts. Series producer Steve Evanson ; Series editor Gill Tierney
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