5/13. Nicholas Crane visits Lytham St Anne's, site of the worst lifeboat disaster in British history, Alice Roberts relates the discovery of 5,000-year-old human footprints on a beach near Liverpool, Neil Oliver experiences the dangerous quicksands of Morecambe Bay and Mark Horton takes a look at the coastal defences at the end of Hadrian's Wall, once the outer edge of the Roman empire.
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