There were many attempts to escape over and under the Berlin Wall but Tunnel 29 was highly unusual for tunnelling into East Berlin rather than out to the West. Led by Joachim Rudolph, who had himself escaped to West Berlin in 1961, a group of students and refugees tunnelled into the eastern half of the city in an attempt to rescue friends and relatives. This was an extremely perilous mission with the risk of death ever-present from the tunnel collapsing or the Stasi discovering their work. Even more bizarrely the whole endeavour was funded and documented by an American film crew as NBC bidding to win the ratings war back in the USA. To tell this heroic tale Dan is joined by broadcast journalist Helena Merriman. Helen presented and produced Tunnel 29 for the BBC and has written a book, Tunnel 29: The True Story of an Extraordinary Escape Beneath the Berlin Wall, all about this incredible escape.