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Big, Bigger, Biggest

S3-E3 London Underground Revealed
Premiere

S3-E3 London Underground Revealed

Sat 6 Aug 2pm - 3pm National Geographic Channel
See Repeats
Sat 6 Aug, 3pm - 4pm National Geographic Channel +1
HD WIDE SUR
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Summary

An exploration of London's Underground, the biggest metro system in the Western world, and the technological advances that made it possible, including the invention of easy tunnelling, the propulsion required to power the trains, the creation of subterranean stations and special fire-safety systems.

Education Documentary

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