christwigg
11 years ago
There was a short underground section at Grimes Graves flint mines in this show (as well as caves at Creswell Crags)

http://www.bbc.co.uk/iplayer/episode/b03npt4m/Sacred_Wonders_Of_Britain_Episode_1/ 

(RJV will love this as I know he has a soft spot for Neil Oliver)

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