Series following 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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A look at London's Crossrail, which requires building 42km of tunnels under the city.
Engineers building Crossrail battle to rebuild a Victorian tunnel under the Royal Docks.
The engineers building Crossrail race to build ten new train stations across London.