S1 E1: Holborn
Tim Dunn and Siddy Holloway explore the shortest branch line on the London Underground network.
43 minutes
Secrets of the London Underground
There are miles of abandoned tube tunnels running under London. Railway historian Tim Dunn teams up with Siddy Holloway from the London Transport Museum to explore the disused parts of London's tube network.
Director: Rich Mathews
S1 E2: North End
Siddy takes Tim on a mystery tour of a secret station deep beneath Hampstead Heath.
42 minutes
S1 E3: Piccadilly Circus
Tim and Siddy explore the disused parts of Piccadilly Circus.
43 minutes
S1 E4: Euston / York Road
Tim and Siddy explore the hidden parts of Euston underground station.
42 minutes
S1 E5: St Mary's / Aldgate East / Oxford Circus
Tim and Siddy have a night-time adventure as they go on a late-night exploration.
43 minutes
S1 E6: Clapham South / Moorgate
Tim and Siddy are deep beneath Clapham Common; they're so deep, the Northern line is running above their heads.
42 minutes