Well certain ' forces of the law ' wouldn't go near their camp without what ammounted to near military backup; of course I only found that one out the hard way, scrabbling up a water tower ladder as dogs were set on us, my chum calling on his radio, then finding all the rungs had been cut to less than 1mm.
I only had one ' hairy ' flight from there in over 14 years - and that was by a non resident pilot - I had plenty of frights & grey hairs from works engineering, be it at high roof level or subterainian, but the worst by far were the encounters with the unmentionables.