Secrets of the London Underground S2E2 backdrop

Secrets of the London Underground poster

Secrets of the London Underground (2021)

Name: Waterloo & City and Mark Lane
Released: 2022-05-12

S2E2 Waterloo & City and Mark Lane

May 12, 2022 Season 2 Episode 2 Documentary

Tim Dunn and Siddy Holloway embark on an adventure to uncover the secrets of the Waterloo and City line. This unique railway is notable for being the only one that runs completely underground.