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Reminds me of the bike down Swildons

mikem

Well-known member
https://www.pinkbike.com/video/511638/

Although some places offer it commercially: https://www.slovenia.info/en/stories/go-underground-by-bike-and-kayak
 
There was also the unicycling in some Llangattock caves, from memory I think Aggy and Craig Y Ffynnon?

Videos were on YouTube
 
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