Follow a team of more than 10,000 engineers and construction workers as they race to build a brand new railway under London - Crossrail - London's new Underground.
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Episode 1
A look at London's Crossrail, which requires building 42 km of tunnels under the city
Episode 2
Engineers building Crossrail battle to rebuild a Victorian tunnel under the Royal Docks.
Episode 3
The engineers building Crossrail race to build ten new train stations across London.
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