Tunnel 29 is the true story of the most remarkable escape tunnel dug under the Berlin Wall. Drawing on hundreds of hours of interviews with the survivors, and thousands of pages of Stasi documents, Helena Merriman brilliantly reveals the stranger-than-fiction story of the ingenious group of student-diggers, the glamorous red-haired messenger, the American News network which films the escape, and the Stasi spy who betrays it. For what Joachim doesn't know as he burrows closer to East Germany, is that the escape operation has been infiltrated. As the escapees prepare to crawl through the cold, wet darkness, above them, the Stasi are closing in.