Thirty years after the fall of the Berlin Wall, Helena Merriman tells the extraordinary true story of a man who dug a tunnel into the East, right under the feet of border guards, to help friends, family and strangers escape. It’s also the story of the Stasi spy who betrays the tunnel, the American TV network that funds it, and the love that develops between refugees who find freedom together. This ten-part series is based on original interviews with the survivors as well as thousands of documents from the Stasi archives and recordings from the tunnel.

Sundays at 6.45 p.m. (starting 24 November)