.... the cavers whom explored these caves weren't that mindful of tourists...
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On this note, I can vouch first hand (and the report is on here somewhere for one of them) of having a hairy experience with some 30 year old, 1mm thick polyprop at the far reaches of 2 caves.
On speaking to the person who laid both lines the answer I got was "well, we never really expected anyone else to go there"
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