in a salt mine, winter or summer, it's always a comfy 68 degrees, with a humidity of 45 percent, good for keeping important stuff safe.
Tornadoes can't touch the vault burrowed the equivalent of 60 stories underground. Floods cannot permeate the thick shelf of salt that doubles as the warehouse ceiling.
There are no seismic faults nearby that anyone knows of.
http://www.overdrive.fi/forum/threads/vanhoja-valokuvia-ameriikan-raitilta.267070/page-498#post-3112104
https://www.sfgate.com/news/article/Treasures-Kept-Safe-in-Salt-Mines-Below-the-2778029.php
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