"A look at London's Crossrail, which requires building 42 km 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."

"Linda and her team must battle fault lines that threaten the site with flooding, race to build access tunnels to alleviate pressure on a congested construction site, and piece together a giant geometric jigsaw that will form a station entrance."

"Engineers must construct and fit out a new station at Paddington, erect a 130m long great glass canopy to soar above the structure, and plug directly into Brunel's original station."