the distinct chambers of the undertunnel corridors, a quiet place. it is dark down here underground But some walls are sparsley lit across the way. 
       - Some light seems to beam in down from above,shafts & pillars oflight both casting dappled light onto the Stone and brick surfaces
                   
    the Undertunnels link multiple parts of the Castle Dungeon..     a dark, dank,half-rotten library book room Is neately tucked away in between the cracks.       Presumably this is part of the  Sorceresses Hideout...     On one sideof the Hallways there seemsto be apartly-disused Orrery, or Time-Telling-Well,halfof these undertunnels are overgrown now, Yet, no doubt, another half of
   these corridors lead down into mostly-forgotten secret  passageways. who knows?

the stairways seem to lead off both Upwards and also downwards,some of these cloisters seem to have deep drops. Take care not to fall.

-  You are in, underzone/subterrenean levels:" the Undertunnels corridors "