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.

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.