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

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.

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

Elizabeth Line

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

The Final Countdown

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

Platforms and Plague Pits

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

Tunnels Under the Thames

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

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S1 E4 | The Final Countdown