Granted special access to the secret workings of the Tube, and with the aid of the London Underground staff who know it best, engineer Rob Bell discovers the fascinating hidden history of how London's iconic metro was built.
Rob explores the construction of the world's first deep Tube Line known today as the Northern Line, which runs 36 miles through London and connects the boroughs north and south of the Thames. 700,000 passengers rely on it every day.
Rob explores the construction of the world's first deep Tube Line known today as the Northern Line, which runs 36 miles through London and connects the boroughs north and south of the Thames. 700,000 passengers rely on it every day.
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