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 2025. A total of 32 episodes have been broadcast, most recently in June 2026.
Last episode
1:00:00
1:00:00Secrets Of The London Underground
Tim Dunn and Siddy Holloway visit North End under Hampstead Heath. Abandoned before completion, the station became a Cold War bunker.
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1:00:00Tim 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 4
1:00:00
1:00:00Tim Dunn and Siddy Holloway explore the unusual station at Old Street, which serves both the Northern line and mainline trains.
1:00:00Tim Dunn and Siddy Holloway meet at Gloucester Road in London's museum quarter - a station serving the Circle, District and Piccadilly lines.
1:00:00Tim Dunn and Siddy Holloway explore the rich history of Stockwell station on the Victoria Line.
1:00:00Tim Dunn and Siddy Holloway explore the maintenance depot at Northumberland Park in north London.
1:00:00Tim Dunn and Siddy Holloway explore the maintenance depot at the end of the Central Line, responsible for keeping the entire tube running.
1:00:00Tim Dunn and Siddy Holloway explore the very first tunnel under the Thames.
1:00:00Tim Dunn and Siddy Holloway get exclusive access to the disused station at South Kentish Town.
1:00:00Tim Dunn and Siddy Holloway explore the forgotten tunnels underneath one of Britain's busiest stations - Waterloo.
1:00:00Tim Dunn and Siddy Holloway explore Paddington station to discover the tunnels hiding clues to its recent past.
1:00:00Tim Dunn and Siddy Holloway explore Earl's Court station where the old and the modern sit side by side.
Series 3 1:00:00
1:00:00Tim Dunn and Siddy Holloway explore hidden parts of Archway. Once called Highgate to encourage more people to travel there before an actual Highgate station existed.
1:00:00Tim Dunn and Siddy Holloway snoop around TFL's gargantuan maintenance facility - Acton Works.
1:00:00Tim Dunn and Siddy Holloway discover the hidden corners of Shepherd's Bush.
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.
1:00:00Series 1, Episode 4 - Euston
Expected on
Tim Dunn and Siddy Holloway explore the hidden parts of Euston, including unique features not found elsewhere and the bits set for demolition for HS2. 1:00:00Series 1, Episode 3 - Piccadilly
Expected on
Tim Dunn and Siddy Holloway explore the disused parts of Piccadilly Circus, and visit the long-abandoned Highgate surface station.