A bit of work info:
The first ladder at the back (right through the second pipe) has had some extra reinforcing and a bit of tidying at the top to hold back loose rock, but you still need to be careful.
Second ladder appears sound
Third ladder, rotten and hanging, has a new ladder alongside.
Interesting workings up there but unsafe to proceed further in my judgement.
Something will eventually be done.
As its SAM I have to get consent normally even for undergound work, however this was Health and Safety.
My avatar is a poor likeness.