What an amazing place!
reminds me a bit of some of those rather lurid fantasy world artworks one occasionally sees, only a hundred times more wonderful as it happens to be real.....and underground 🙂
I haven't heard of Carnallite before. Seems to produce stable roadways judging from the photos, similar to photos i've seen of the roadways driven in rock salt.
Wonder if they get anything remotely similar in Boulby potash mine.
(By the way didn't, as usual, think much of the text. Have downloaded the photos so I can enjoy them at my leisure without being subjected to "Daily Fail speak" every time I look at them)
'I wonder how many breakfasts, and other meals we have missed inside that nasty clockless, timeless hole?'
'The Hobbit'
J R R Tolkien.