Non veni pacem mittere, sed gladium.
Considering it's Australia there is probably something lurking in that foam that can kill you. ;-)
Perhaps a Great Foam Shark
I'd be careful about getting too deep in that - you won't float, can't breath it - and I bet there isn't a swimming stroke that'll keep your head above the surface. It's like some women - exotic and entrancing, and deadly if you don't respect them properly. ;-)