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Stream the full Secrets of the London Underground Season 1 Episode 1 movie online for free in crystal-clear HD quality. No downloads required—just press play and enjoy the action, complete with English subtitles for an enhanced viewing experience.

Tim Dunn and Siddy Holloway explore the abandoned branch line between Holborn and Aldwych, closed in the 1990s. And at Holloway Road, they find out about the Tube's only spiral escalator!