Series exploring Britain's coastline. Nicholas Crane visits the beautiful coastal area of Sefton Sands and the surrounding mudflats, where he discovers 5,000-year-old footprints in the mud before the tide comes in to make them disappear forever.
See all episodes from Coast
See all broadcasts of Sefton Sands (10)
Presented by a team of experts, between them they can investigate almost anything!
Visit BBC Earth, the new home of wildlife on the BBC.
Sign in to the BBC, or Register