The North Channel is the stretch of water which lies between Scotland and Northern Ireland. At its narrowest, it's just 13 miles wide. In this programme, Helen Mark explores the stories surrounding the journeys which are made from one side to the other. She meets one of the crew working on the passenger ferries which plough back and forth and learns what life is like for those whose working lives centre around this journey. She hears about the sad story of the Princess Victoria - a ferry which sank making the crossing in 1953, with the loss of more than 130 lives.

There have been suggestions for a fixed crossing, either a bridge or a tunnel, for more than a century - an idea recently revived by Boris Johnson. Helen asks an architect whether it could ever really happen. She also meets a woman preparing to try and make the crossing under her own steam, by swimming between the two coasts - braving the cold, the currents and the jellyfish.

Helen reflects on her own personal relationship with the North Channel - having been born on one side, but lived most of her life on the other - and asks whether this narrow strip of sea serves to connect or divide the people on either side.

Produced by Emma Campbell.