Thanks for posting this, Ciive,
Am (hopefully) showing a couple of new people around in October, and was planning to show them the hidden caban.
I'm not really that surprised by this turn of events, as much of the area directly east of the 34 incline is in a similar state, as been mentioned before by myself and others.
When I was down on the floor G levels near the hidden caban about a year ago, sprinkles of fresh slate. noticeable by it's lighter ash-like colour, together with a fresh slate smell was much in evidence, together with flakey de- lamination in the walls.
Floor F, also becomes suddenly and dramatically unstable in roughly the same area
Think the Llyn Bach cracks ultimately have something to do with it
'I wonder how many breakfasts, and other meals we have missed inside that nasty clockless, timeless hole?'
'The Hobbit'
J R R Tolkien.