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.

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.

This episode follows engineers building London\'s brand new underground railway, Crossrail, as they take on a Great British obsession - building train tunnels under water.

A team battles to put together the giant jigsaw that will become a cathedral-sized station at Canary Wharf. It\\\'s so big, they have to build it in a dock and underwater. Its architect-designed roof is so complicated it comes in a kit of over 2,500 pieces.

With exclusive access, this returning series follows the construction workers of Crossrail as they battle to finish the final stages of the new Elizabeth Line underground railway beneath the streets of London.

Final part of an exclusive series following the construction of Crossrail - one of Europe’s largest projects and one of the most ambitious in Britain since the time of Brunel.