Rush hour is the biggest test on the underground and it can be too much for some passengers. Station Supervisor Bob Weedon at Bank has to deal with some injured passengers and faintings in a row. Chief operating officer Howard Collins has to step in and help following a power failure on the Jubilee Line that threatens to disrupt the evening rush.

The work of emergency response units on the London Underground are taken a look at. Two drivers talk about the horror of seeing someone falling or jumping in front of their trains. The series also looks at how the underground deals with the demands of the annual Notting Hill Carnival.

Behind-the-scenes look at the London Underground, beginning with weekend rail replacement works threatening to disrupt the daily service, and a woman pushed onto a live track during a busy Saturday night at Leicester Square. The number of passengers using the Tube at the weekend has doubled in the last decade, forcing the system to adapt to changing circumstances.

Faulty doors and a signal failure cause major delays on the Victoria Line, where head of upgrades David Waboso is trying to work on a solution to the network's trebling of passengers over the past 10 years. Meanwhile, supervisor Barry Griffiths endeavours to keep the crowds moving at Tottenham Court Road as work continues to make the station six times bigger.