Is Secrets of the London Underground coming back?

Secrets of the London Underground is currently on a seasonal break, with no upcoming episodes scheduled. The series has been a regular feature on U&Yesterday since its debut in July 2021.

This documentary series explores hidden and forgotten areas beneath London’s bustling transport network. Railway historian Tim Dunn and Siddy Holloway from the London Transport Museum investigate abandoned tunnels, secret bunkers, and concealed staircases, revealing the stories behind some of the city’s most clandestine sites. The show provides a behind-the-scenes look at places such as London's most secretive tube station, the original terminus of the first electric railway, and a station that played a significant role during World War II, accessible only by precise train stops.

The series has aired four seasons, beginning in 2021 and most recently in 2024, each consisting of around ten episodes. The cast features Tim Dunn and Siddy Holloway, who guide viewers through these hidden locations. The show is rated 6.6 on TVMaze and each episode runs approximately 60 minutes.