Secrets of the London Underground (2021)
| First Air Date: | 2021, July 19 |
| Last Air Date: | 2024, September 3 |
| Status: | Returning Series |
| Seasons: | 4 |
| Episodes: | 36 |
| Episode Runtime: | 44 min |
| Countries: | United Kingdom |
| Production: | Brown Bob Productions |
| Cast: | Tim Dunn, Sigurbjörg Alma Ingólfsdóttir |
Overview:
Railway historian Tim Dunn and Siddy Holloway from the London Transport Museum explore hidden areas of the London Underground that—despite being just feet away from where millions of people regularly travel—hardly anyone knows about. The pair will explore abandoned tunnels, secret bunkers and hidden staircases that have been concealed from public view for years.