Neil Oliver discovers the fatal engineering errors behind Cape St George Lighthouse that cursed Wreck Bay for four decades. In Callala Bay, Tim Flannery uncovers the lifesaving properties of seaweed. On Gabo Island, on the Victorian side of the border, Emma Johnston witnesses a secret method for growing unusual pearls in wild abalone. In Eden, Neil Oliver investigates the truth behind the folktale of Old Tom, the country’s most famous killer whale. Tim Flannery unearths a piece of lost British treasure that went down with the Cumberland ship in World War I. Part of the "Coast Australia" series.