In Swanage, Dorset, the crew race to the rescue of a diver whose life hangs in the balance and help a yachtsman whose hand has been badly damaged by an anchor chain. In Kinghorn, on the east coast of Scotland, a swimmer is swept out to sea and is at severe risk of hypothermia. On Holywell beach in Newquay, a multi-agency operation kicks into gear when a walker suffers a serious injury.