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 19 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 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.
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.
1:00:00Tim 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.
1:00:00Series 2, Episode 5 - London Bridge
Expected on
Tim Dunn and Siddy Holloway explore the disused parts of London Bridge. Siddy visits Ongar in Essex and nearby Blake Hall. 1:00:00Series 2, Episode 4 - Brompton Road
Expected on
Tim Dunn and Siddy Holloway walk the Piccadilly line at night to explore the hidden World War 2 remains of Brompton Road.