More than one billion people use the London Underground annually, yet few of them know just how haunted the tube really is. This hair-raising documentary investigates the supernatural secret... Read allMore than one billion people use the London Underground annually, yet few of them know just how haunted the tube really is. This hair-raising documentary investigates the supernatural secrets of the oldest underground network in the world, exploring the graves, church crypts and ... Read allMore than one billion people use the London Underground annually, yet few of them know just how haunted the tube really is. This hair-raising documentary investigates the supernatural secrets of the oldest underground network in the world, exploring the graves, church crypts and plague pits that tube tunnels have disrupted.