Try reading the excellent paper on 'Britain's longest maze cave: Hudgill Burn Mine Caverns, Cumbria, UK' by John Dale et al., in Cave & Karst Science Vol 42(1), available on the BCRA website at:
https://bcra.org.uk/pub/candks/index.html?j=124
(click on the padlock link for details of how to acess this if you are not a member of BCRA)
or see
https://www.semanticscholar.org/paper/2-Hypogenic-Caves-in-the-UK-Farrant-Harrison/569529725aea5d61050f34e19acbb96baa8e0279
?15 really isn't much for the wealth of information in Caves and Karst of the Yorkshire Dales, Volume 1. Most text books with this much information cost over ?100...