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 36 episodes have been broadcast, most recently in July 2025.
Last episode
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1:00:00Secrets Of The London Underground
Tim Dunn and Siddy Holloway explore the unusual station at Old Street, which serves both the Northern line and mainline trains.
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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.
1:00:00Tim 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.