There was a lot of talk about rock salt this winter, how much there was and why it wasn't on our roads during the heavy snows.
Some grumpy googling unearthed some fascinating articles on the use of salt mines as archives. See this video on the bbc website.
Apparently salt mines make the perfect storage space for documents as there is low humidity, no water and no UV lights. The excavations leave giant roads for access and storage and strong pillars of ice maintain the stability of the underground 'building.' Amazing...
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