Life on the Edge

S1, E1: Wild and unpredictable, the Scandinavian coast is a place of haunting beauty and dangerous extremes - a journey from storm-swept islands crowded with seal pups to 3,000ft deep fjords where sea eagles fly and base jumpers parachute from the edge. In the far north, tropical currents and Arctic seas collide, creating riches - billions of herring tracked by orcas and humpback whales - while providing a home to thousands of seabirds, including the feisty puffin.