The Coast team reveals how shared seas unite us all as we take a circular tour of the Irish Sea. Neil Oliver explores the Isle of Man, home of the Laxey Wheel, the largest working waterwheel in the world. On the edge of the Irish Sea at Morecambe Bay, Alice Roberts gets trapped in quicksand to discover what makes it so sticky and so deadly. She learns survival tips and sees how the emergency services use specialised gear to rescue strugglers stuck in the sand. In Liverpool, Mark Horton unearths the 150-year-old remains of the ship that broke Brunel's heart. The ill-fated Great Eastern was the famous engineer's final masterpiece and the largest passenger liner ever built until Titanic took her record. Ulsterman Dick Strawbridge uncovers the story of inventor Harry Ferguson, the first man to fly in Ireland, who went on to revolutionise farming worldwide with his groundbreaking tractor, the Little Fergie.