It's in Wales, I'm not sure if there's rules in posting links here but search for Go Below Wales, Go Below is the company that does the tours.
I highly recommend the Ultimate Extreme package where you spend about 7 hours under the formally abandoned slate mine, as you traverse and abseil deep into the caves and can get an idea of what the miners had to go through back in the day with only candles to light the way, absolutely insane.
At the end you get to do a "dead man's drop" where you're hooked up to an auto belay and jump into a pitch black void. When I say pitch black I mean it, your lights don't do anything as there's nothing for it to reflect off. Obviously the auto beley catches you after a second but for a moment you feel like you're just falling into a never ending hole.
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u/rapafon Mar 04 '25
I went on the world's longest underground zipline which was cool; pitch black darkness in a cave in wales.
I'd probably do this zipline but I'd be double checking all the attachments cause "professional" or not, I don't trust anyone that much.