Posted by OH_ZOG_NO Whats the story behind the suspended cages? What an amazing place, nice find.
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If it's a coal mine perhaps it was to hold the canaries... Little birds that historically were brought down mining shafts to test how concentrated the gas was down there. The canaries would die (or pass out) before the humans did so it gave the workers a warning to get the heck out of there. Though this place might be too recent for that, the canaries got their job stolen by machines
so Blackhawk is probably right.