Behind the scenes on the London Underground. Rush hour is the Tube's biggest test - but it can be too much for some passengers. Bob Weedon has to deal with five injuries.

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.