A massive boring machine carves a 42-kilometre shaft under London.

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 Elizabeth Line underground railway beneath the streets of London; the Elizabeth line's safety is put to the test; a look inside a vast commuter hub.