Unsure about ACC but people used to do through trips, I had a conversation with someone once about it.
I was once in Western Shaft at adit level and was talking to people on the surface, I had to assure them I was OK lest they went off and did something silly like calling out rescue.
The last time I was there Cwffty adit could only be explored for a short distance due to stuff coming down. Also part of the 10 fthm was no longer accessible. This is the bit with the interesting false floors.
The real prize is Western Shaft with the great big clack boxes
I really hanker for a trip in there, but have 'things' on the boil elsewhere, and would like to get these 'things' completed for NAMHO.
I now have a secret weapon for the photography. The 32K torch!
My avatar is a poor likeness.