Matt Baker and Ellie Harrison are in Suffolk finding out how erosion has shaped the landscape, swallowed up whole towns and inspired award-winning authors. Matt takes to the sea with scientists using the latest technology to get a look at Britain's Atlantis, the lost town of Dunwich, swallowed by the sea centuries ago. He later joins extreme artists who rush out to sketch the coast each time a storm tears more chunks out of it. Ellie finds out how erosion plays its part in recreating important saltmarsh habitats. She also meets award-winning author Helen MacDonald and hears how Helen overcame personal grief through a love of goshawks and turned the experience into a literary smash. Adam Henson joins the Gloucestershire Fire Service as they train to rescue animals in emergency situations. For most people it's one of life's essentials, yet milk frequently costs less than water. Tom Heap asks if paying more for your daily pint would help struggling dairy farmers make a profit.