Going behind the scenes of the world's oldest, largest and busiest underground train network as it undergoes the biggest overhaul in its history.
Rush hour is the Tube's biggest test - but it can be too much for some passengers. Station Supervisor Bob Weedon at Bank has to deal with five injuries and faintings in a row during one rush hour crush. Chief operating officer Howard Collins must muck in when a power failure on the Jubilee Line threatens to disrupt the evening peak. And the Tube's most unusual employee, a hawk called Toyah, is put to work on pigeon patrol.