I doubt that 1mm will be enough in most Australian waters unless you are a really warm blooded person!
Ningaloo is pretty far north on the continent and we are in 3mm suits even when the water is 28c - and most of the year our water isn't that warm...during a longish dive you'll most likely still feel cool...
Ningaloo is pretty far north on the continent and we are in 3mm suits even when the water is 28c - and most of the year our water isn't that warm...during a longish dive you'll most likely still feel cool...