Geographer Nicholas Crane presents a 13-part journey around the coast of the United Kingdom, uncovering stories that have made us the island nation we are today. This leg takes him from Carlingford Lough to Lough Foyle in Northern Ireland. He cycles the 23 miles of Antrim's Coast Road, a journey that cuts through some of the darkest moments of Irish history. Neil Oliver unlocks the secrets of Belfast's most famous ship - the Titanic.