Secrets of the London Underground

Tim Dunn and Siddy Holloway explore the shortest branch line on the London Underground network. Siddy visits the site of one of the Tube's most bizarre inventions: a spiral elevator.

Tim Dunn and Siddy Holloway visit one of the Underground’s most secret places: North End under Hampstead Heath, abandoned before completion. Siddy takes us on a tour of Embankment's floodgates.

Tim Dunn and Siddy Holloway explore the disused parts of Piccadilly Circus, the Underground's grandest station. Siddy visits the abandoned station above Highgate.

Tim Dunn and Siddy Holloway explore the hidden parts of Euston, including unique features not found elsewhere. Siddy visits York Road station, unused by passengers for nearly 90 years.

Tim Dunn and Siddy Holloway have a night-time track walk exploring long-forgotten stations on the District line in Whitechapel. Siddy shows us the sprawling disused parts of Oxford Circus.

Tim Dunn and Siddy Holloway explore Clapham South's deep-level shelter, where thousands of Londoners slept during the war. Siddy sees the remains of a tunnelling machine at Moorgate.