Somehow dealing with unbelievably dangerous wildlife is built into Aussie DNA.*
From The Sun:
Nathan Podmore and pal Dave Richards were spear fishing off the coast of Western Australia when the 9ft beast started circling them.
Footage — captured on Nathan's head cam (posted below) — shows them paddling helplessly in the ocean as the shark comes alarmingly close to them.
Cut off from their boat they could only wait to see what would happen.
The shark circled the friends three times in three minutes — before swimming directly at them.
*I have no proof of this.
Source -> http://www.thesun.co.uk/sol/homepage/news/4428200/Spear-fisherman-fight-off-Great-White-Shark.html
Earlier related links -> http://www.dannyfinnegan.com/2011/06/great-white-sharks-like-acdc.html & http://www.dannyfinnegan.com/2012/07/its-still-in-your-line.html