At the coast, two worlds collide. Coasts is the story of how our Blue Planet’s wildlife survives in this ever changing world. It’s a roller-coaster ride of heart stopping action and epic drama, with characters from beautiful to bizarre. This episode is a rollercoaster ride of heart-stopping action and epic drama, peopled with characters from the beautiful to the bizarre. We meet fish that live on dry land and puffins that must travel 60 miles or more for a single meal, and witness a life-and-death struggle in a technicolour rock pool.