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 23 episodes have been broadcast, most recently in September 2026.
Last episode
50:00
50:00Secrets Of The London Underground
Tim Dunn and Siddy Holloway explore King William Street, the original terminus of the first electric Tube in the world.
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1:00:00Tim Dunn and Siddy Holloway discover the hidden world of the Waterloo and City, the only line entirely underground.
50:00Tim 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.
50:00Tim 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.
50:00Tim 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.
50:00Tim Dunn and Siddy Holloway explore the abandoned branch line between Holborn and Aldwych. And at Holloway Road they find out about the Tube's only spiral escalator.
Series 3 1:00:00
1:00:00Tim Dunn and Siddy Holloway head to the sprawling Heathrow Airport underground stations - the first ever underground rail link between an airport and a city.
1:00:00Tim Dunn and Siddy Holloway are exploring a station in the beating heart of London's theatreland - Leicester Square.
1:00:00Tube fans would be right in thinking there are 272 Underground stations, but Siddy Holloway has such unique access, she is taking Tim Dunn to the 273rd - West Ashfield.
1:00:00Tim Dunn and Siddy Holloway embark on a night-time track walk to the abandoned station of British Museum.
1:00:00Tim Dunn and Siddy Holloway are heading to a stunning station you won't find on modern-day tube maps - Dover Street, now known as Green Park.
1:00:00Tim Dunn and Siddy Holloway begin their journey at South Kensington, home of Victoria and Albert Museum, the Science Museum and the Natural History Museum.
1:00:00Tim Dunn and Siddy Holloway head to London's iconic Camden Town station - a labyrinthine junction on the Northern Line.
Series 2 1:00:00
1:00:00Tim Dunn and Siddy Holloway explore the tube station with the most platforms, Baker Street.
1:00:00Tim Dunn and Siddy Holloway visit the cathedral-like Greenwich Power Station, which stands ready to power the tube at short notice.
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.