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Stream the full Secrets of the London Underground Season 1 Episode 6 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 and Siddy are deep beneath Clapham Common; in fact, they're so deep, the Northern line is running above their heads. This is Clapham South deep level shelter, an enormous, purpose-built air raid shelter. During the Second World War, as rockets landed on the streets above, thousands of people could sleep down here in more than a mile of tunnels - all built by London Transport in the same way they dug tube tunnels.