When I was growing up in northern England it was quite popular but it was called potholing. I never heard the term spelunking until I came to the US.
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Interesting!
Yeah for some reason my node went down, the channel closed & there was no explanation as to why & I lost some sats. I only use Lightning for zaps on Nostr so I thought fuck it I'm not going to lose more sats to that again so I haven't opened another channel but maybe I could go with a cloud based option.