Hollinghead Bank levels


Does anyone know about the levels Round Hollinghead Bank by Boot? I poked my head in and seem interesting but only had a phone and the kids and SWMBO were waiting for me, one of the levels had two portals, one looked like a nice coffin example

Also a shaft up past blea tarn that looked interest to abseil down

Wanted to edit but looks like the shaft could be part of Nab Gill mine and the edits part of blea tarn mine. Anyone done any exploring of these or got any plans/surveys?