4/8 The team visits Cardiff marina, takes in the Gower Peninsula and finishes in St David's. (R)
BBC Two Wales
Nicholas Crane explores the fishing communities in Scotland.
BBC Two England, Scotland, Wales (Analogue) only
4/8 Neil Oliver discovers a global network of communication cables under Porthcurno beach. (R)
BBC Two except East, Yorkshire
Nicholas Crane retraces the steps of smugglers in Robin Hood's Bay. (R)
BBC Two Scotland
The settlement of the Scots at Strangford Lough and the treacherous channel of Torr Head.
BBC Two except East, Scotland, Yorkshire
Historian Neil Oliver uncovers a real-life horror story on the Smalls Lighthouse.
BBC Two Wales (Analogue), Wales only
BBC Two England, Northern Ireland (Analogue), Northern Ireland, Scotland only
Nicholas Crane investigates the freak floods of 1953.
Stone Age remains of Britain's first house are recovered by a team of archaeologists. (R)
12/13 A visit to East Anglia, a stretch of coast fighting a constant battle to survive the seas. (R)
Exploring the relationship between citizens and the sea. (R)
Alice Roberts rediscovers an old and unusual walkway near Whitehead, County Antrim. (R)
BBC Two England
Nicholas Crane and Alice Roberts explore Northern Ireland's coastline. (R)
BBC Two except East, England, Yorkshire