Face the challenges of constructing London's colossal new commuter railway.
EPISODE 1
Super Tunnel
A massive boring machine carves a 42-kilometre shaft under London.
EPISODE 2
Drilling down on a fresh passage under the Thames and a rebuilt Victorian tunnel.
EPISODE 3
Wrestling with a complex underwater assembly; unearthing London's gruesome past.
EPISODE 4
A look at battle fault lines; a Victorian station update; a special guest.
EPISODE 5
A look at Paddington's glass canopy; a father-son duo finishing 66 trains.
EPISODE 6
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.