The redeveloped St. Pancras station sits at the end of a 5.8 billion pound railway line. It is the first major British line to be built for over a century. This series tells the story of the architects, engineers and spin doctors who entered a two year race to complete the station and the line on time. In this episode, the engineers try to finish the base of the station, incurring a 50,000 pound penalty from their bonuses everyday they go over deadline.