It doesn't actually answer your question, flashheart, but this is interesting (from CNCC website):
There are options for further exploration beyond this usual turnaround point (including two further pitches, no anchors). This is the
Upper Series and 1968 Extensions, and these are tight, awkward and may have loose blocks. Directly across on the opposite wall of
the Main Chamber is an awkward 4m climb up, the second opportunity to access the Upper Series. This climb may have a very old in
situ rope which should not be trusted. Onward from the top is a short pitch (15m rope, no anchors in place), which drops down to a
tight corkscrew descent leading immediately onto another pitch. A 18m rope should be belayed at the top of the corkscrew to
protect the descent and rig the pitch, again no anchors so natural belays will have to be located. This final pitch drops into Rift
Chamber, where numerous routes and block chambers can be explored which ultimately all choke within about 50-100m.