We re-explored this shaft with lots of bolting practice from me. I can confirm it's too tight even for skinnys unless children, would be akward capping. The description says it's 100m deep, but given it's 30m deep to the tight point, and stones only drop another 10 or 15m at most it can be 50m deep. Other thing of note is we got to the pass to find I had left the drill behind!