Season 1, Episode 6
Southern England
Air Date: 2014-11-27
Overview: Rob explores a mystical cave system that altered Victorian Britain's view of human history before entering a once top-secret bunker that was constructed to be Britain's nerve centre if the bomb had been dropped during the Cold War. He also follows an underground seam of tin in a mine that stretches out several miles under the Atlantic Ocean.
Runtime: 45 minutes
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