In Lyme Regis, on Dorset's Jurassic coast, the crew face a frantic search for three fishermen whose boat has capsized in the River Axe. On the north Cornish coast, the lifeguards at Harlyn race to the rescue of a teenager caught out by a notorious rip current.On the west coast of Scotland, the Oban crew dash across the water to the remote island of Kerrera to help an injured walker, and across the Irish Sea, the Kinsale crew have to act quickly to help a skipper who, while trying to single-handedly sail his yacht across the Atlantic, is drifting without power towards rocks.