filmed in the caves. All the underground scenes of the BBC series "Merlin", were filmed in the Caves. The caves have also long been used for filming science fiction scenes, such as in Blake's 7. The caves featured substantially in the children's series "The Changes", "The Jensen Code" and "Kidnapped" among many others. More recently the caves have been featured in episodes of Britannia, Cursed and His Dark Materials. Reported paranormal activity Claims of paranormal phenomena at the caves have been made over the years. These include reported sightings reports of the sound of metal clanging in the distance and many reported sightings of an old miner and the sound of footsteps and pick axes working. In popular culture The caves were used as the interior for the Sycorax spaceship in the Doctor Who Christmas special, The Christmas Invasion in 2005. See also Old Bow And Old Ham Mines References External links www.clearwellcaves.com/ BBC archive film of Clearwell Caves from 1977 Caves of Gloucestershire Museums in Gloucestershire Mining museums in England Forest of Dean Iron mines in England Mines in Gloucestershire