Historical background:- used to be popular, then people got in trouble for climbing the highly visible routes in The Gap itself. About the only route that saw any traffic was the Classic Duelling Biceps as you were well hidden from the tourists. Council errected a new fence with signs saying it is not safe to cross this fence.
The situation has changed radically as there are now motion sensors on the fenceline and infra-red cameras, all ported back to the local police station. As soon as you cross the fence (anywhere over about a 300m length) all hell breaks loose. In our case police choppers, boat, search and rescue, and regular cops at the top waiting to book us.
It's an awesome climb but I'd avoid it if I were you.