S4 E5 ∙ Thames Tunnel ∙
Tim Dunn and Siddy Holloway explore the very first tunnel under the Thames.
All episodes for series 4 of Secrets of the London Underground
S4 E1 · Earls Court
Tim Dunn and Siddy Holloway explore Earl's Court station.
S4 E2 · Paddington
Tim Dunn and Siddy Holloway explore Paddington station.
S4 E3 · Waterloo
Tim Dunn and Siddy Holloway explore Waterloo station.
S4 E4 · South Kentish Town
Tim Dunn and Siddy Holloway explore the disused station at South Kentish Town.
S4 E5 · Thames Tunnel
Tim Dunn and Siddy Holloway explore the very first tunnel under the Thames.
S4 E6 · Ruislip Depot
Tim Dunn and Siddy Holloway explore the maintenance depot at the end of the Central Line.
S4 E7 · Northumberland Park
Tim Dunn and Siddy Holloway explore the maintenance depot at Northumberland Park.
S4 E8 · Stockwell
Tim Dunn and Siddy Holloway explore Stockwell station on the Victoria Line.
S4 E9 · Gloucester Road
Tim Dunn and Siddy Holloway meet at Gloucester Road in London's museum quarter.
S4 E10 · Old Street
Tim Dunn and Siddy Holloway explore the unusual station at Old Street.
