Hi Ivan,
didn't see this post before.
At present there are no official Australian records for anything, ie recognized by F.R.E.E, AIDA, CMAS etc.
Seb Murat is Australian, he set an unofficial dynamic record of 191m. This will never be recognized by any of the freediving bodies because there was no judge present. Also I know some people that were present at his attempt and he had a pretty major Samba after the record attempt. Herbert's wolrd record of 181m was clean, and has to be under AIDA rules.
That said Seb is extremly good freediver, I think probably in the top 5 in the world in terms of ability. He claims to have done over 8min statics, and I believe it from the dynamic he did.
I hope in future if he goes for a wolrd record attempt he does it properly and get it recognized by FREE or AIDA.
There is an unofficial CB record ie diving down with fins on, of 56m, set by Tony Heughs a spearo. I don't know the details of it but guessing he had lots of witnesses so I believe it.
Sacha Dench :-
http://www.freedive.com.au is hoping to get some official Australian Records together. If you are interested in going for one you should contact her. She is also trying to get an Australian team together to compete in AIDA wolrd cupo in Hawaii.
I'm tempted to have a go at the 56m one myself, I'm not too far from it now. Equalising does get a bit tricky at that depth though.
That said if Seb goes for one I think that would pretty much rule me out, and probably everyone else
Cheers,
Wal