Living only ten minutes away from here and having read the report that Acid-Reflux put up last week (and that nearly ended in serious unpleasantness), I was stung into action. This is one place that I first visited a few years ago after reading a lot about it, but the portal was properly closed up so I'd pretty much given up hope of ever getting in here. Acid's report was awesome and made me want to get in there and see it for myself, along with my trusty Altair4 gas detector.
Acid's...
Port Mulgrave ironstone mine + tunnel, May 2015
Acid's...
Port Mulgrave ironstone mine + tunnel, May 2015