A young woman and her friends are pulled out to sea in a freak rip current. A lifeguard and the coastguard are scrambled as they battle to stay afloat, and a mum is driving home from work when a huge sheet of ice crashes into her windscreen.

A young man is thrown from his motorbike, hitting his head hard on a tree stump. His father dials 999, and an air ambulance crew races to the scene. Elsewhere, tension mounts when the crew aboard a British yacht are surrounded by a pod of killer whales.