Is it possible to climb the shaft / ladders at the end of Tilberthwaite level? How high is it and what's up there?
Absolutely not, they are in a very perilous state.
It is a more or less continual shaft to the top which is below the 'Waterfall level' but at the end of the stope. One wall is solid rock but the other is a succession of very rotten wood making up an ore chute and ladderway, with some attendant rock piles held up with heaven knows what!
It really is only possible to descend it, and even that would be perilous and of course now made impossible by collapses in the waterfall level.
I haven't been in the waterfall level for a few years but the way was impassable then after some deep water. This is at the intersection with a stope and shaft (now blocked) from surface. The level passed below some dodgy supports under the stope and I suspect it is here the collapse has occurred.
Just before this is a small internal shaft which I climbed many years ago which does give you access to the stope above and it may be possible to dig down to the Waterfall level ... but I think it's unlikely given the amount of material on the floor of the stope, and in any case, given the state of the rest of the level and the subsequent shaft down to the deep level, why bother?
If you want a through trip there are much more interesting ones nearby.
The finest workers in stone are not copper or steel tools, but the gentle touches of air and water working at their leisure with a liberal allowance of time.
Henry David Thoreau