Hello squintrex,
I'm not sure whether or not Wollangambe Cave is covered by this forum's "prohibition on publishing details of access to sensitive areas with no tracks", but the information is all over the web. For example, you could search wikiloc.com for "Bell to Wollangambe Crater" and you will find someone's GPX track which visits the main campsite, the crater campsite, and the camp cave.
The cave itself has a level sandy floor. Sleeps eight in luxury, or 30+ at a pinch. Lots of snake tracks over the sand when I was there in April this year. It's in a frost hollow and you will sleep colder than at the other nearby campsites.
For a cracking yarn about how to get there by following a double-boulder and a triple-trunked tree (provided you don't mind walking through the river at midnight and arriving at 2.45am), see this epic account by Rachel Grindlay:
http://grindlay.org/bushwalking/2003121 ... eport.htmlThere is also a cave near Goochs Crater (Goochs Cave), but if you ended up camping in the 'gambe crater it looks like you were trying to find Wollangambe Cave.