Secrets Of The London Underground
Secrets Of The London Underground is a TV show on Yesterday. Tim Dunn and Siddy Holloway explore the disused parts of London's tube network. The program has been available since 2026. A total of 15 episodes have been broadcast, most recently in July 2026.
Last episode
1:00:00
1:00:00Secrets Of The London Underground
Tim Dunn and Siddy Holloway visit the cathedral-like Greenwich Power Station, which stands ready to power the tube at short notice.
Catching up on Secrets Of The London Underground?
Don't want to miss an episode anymore? Set up a free alarm and receive an email when new episodes are available. Handy!
1:00:00Tim and Siddy visit Quainton Road in Buckinghamshire, 50 miles from London - and once on the underground. Siddy also explores Kingsway tramway tunnel.
1:00:00Tim Dunn and Siddy Holloway explore the brand new Elizabeth Line and have access to two of its stations weeks before the line opens.
1:00:00Tim Dunn and Siddy Holloway explore Kings Cross St Pancras, including a secret siding and the disused Thameslink station.
1:00:00Tim Dunn and Siddy Holloway explore the disused parts of London Bridge. Siddy visits Ongar in Essex and nearby Blake Hall.
1:00:00Tim Dunn and Siddy Holloway walk the Piccadilly line at night to explore the hidden World War 2 remains of Brompton Road.
1:00:00Tim Dunn and Siddy Holloway explore King William Street, the original terminus of the first electric Tube in the world.
1:00:00Tim Dunn and Siddy Holloway discover the hidden world of the Waterloo and City, the only line entirely underground.
1:00:00Tim Dunn and Siddy Holloway explore the disused Jubilee line areas of Charing Cross station, now more famous as a film location.
Series 1
1:00:00
1:00:00Tim Dunn and Siddy Holloway explore Clapham South deep level shelter where thousands of Londoners slept in the war.
1:00:00Tim Dunn and Siddy Holloway have a night-time track walk exploring long forgotten stations on the District line in Whitechapel.
1:00:00Tim Dunn and Siddy Holloway explore the hidden parts of Euston, including unique features not found elsewhere and the bits set for demolition for HS2.
1:00:00Tim Dunn and Siddy Holloway explore the disused parts of Piccadilly Circus, and visit the long-abandoned Highgate surface station.
1:00:00Tim Dunn and Siddy Holloway visit North End under Hampstead Heath. Abandoned before completion, the station became a Cold War bunker.
1:00:00