The unprecedented 7/7 bombing and evacuation of the underground system was devastating. Police had to take control of the affected stations. Tube bosses then faced a massive recovery and repair operation, not only for the railway equipment but also their own staff.

For the first time in its history, London Underground has opened its doors to record the day-to-day life of its 16,500 staff who work across a network of 275 stations and 507 trains running on over 300 miles of track. Every year more than one billion people use The Tube that's 3 million journeys a day; commuters, holiday-makers, day-trippers, businessmen and women, students, overseas visitors.

This series goes behind the scenes to tell the story of some of the dedicated and colourful characters who work for LU, doing a difficult job under often challenging and stressful circumstances.

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