The Chislehurst Caves are actually man-made chalk and flint mines (not caves!) dating back over 800 years, with separate sections supposedly dug by the Saxons, Druids and Romans.
how it's used in Merlin In the episode
The Mark of Nimueh, the Caves stand in for the area under the castle of Camelot where the water supply is managed. The Caves might have also been used for the caves in the Forest of Balor that Arthur and Nimueh walk through in
The Poisoned Chalice. However, I suspect that the scenes of Nimueh plotting at her font or well are filmed against a green screen in the studio, and the chasm where Arthur finds the Mortaeus flower likewise (perhaps using the set providing a ledge in the cave of the Great Dragon).
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