DECLASSIFIED takes you deeper into the secrets and stories that have shaped our world.

Declassified

Final safety checks are performed before the line is inaugurated by the Queen.

Super Tunnel

A look at the Crossrail labyrinth with its CEO; new delays and costs mount.

A shocking delay is announced, and the crews hustle to finish the line.

The Elizabeth line's safety is put to the test; also, a look inside a vast commuter hub.

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

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

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

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Face the challenges of constructing London's colossal new commuter railway.

S1 E5 | Super Tunnel