Follows a team of more than ten thousand engineers and construction workers as they race to build a brand new railway under London - Crossrail - London's new Underground. Costing fifteen billion pounds, it's the biggest engineering project in Europe and a huge challenge to pull off.

Drilling down on a fresh passage under the Thames and a rebuilt Victorian tunnel.

Wrestling with a complex underwater assembly; unearthing London's gruesome past.

A look at battle fault lines; a Victorian station update; a special guest.

A look at Paddington's glass canopy; a father-son duo finishing 66 trains.

The battle to finish the final stages of the new Elizabeth Line underground railway beneath the streets of London. Costing over fifteen billion pounds and stretching 120km across the capital, this extraordinary construction project is one of the biggest in Europe and one of the most ambitious engineering feats in Britain since the time of Brunel.