They are indeed very intelligent creatures. There are a number of responsible studies being made that are looking at the GWS social behaviours and language and they are digging up some very deep stuff. For example, did you know that GWS communicate by subtle body movements? When you start to understand these you can actually communicate with the GWS underwater! Example, a turtle and a GWS have been observed communicating to each other. It appears there may be some sort of universal language of the sea! But before I go to far hypothesising I will wait for more results of different studies before jumping to any far fetched conclusions (which I may have already done rofl ).
I haven’t had the pleasure of freediving with a GWS yet, although I've been lucky enough to freedive with other species such as [ame="http://en.wikipedia.org/wiki/Tiger_Sharks"]Tiger Sharks[/ame] and [ame="http://en.wikipedia.org/wiki/Oceanic_whitetip_shark"]Oceanic Whitetip Sharks[/ame]. But it is clear that if you are going to try such ventures there are some very key factors worth observing.
1 Understand the animals behaviours and the environment you are about to enter.
2 Only approach in a neutral situation (i.e. DO NOT encourage the shark to you with any sort of food source)
3 Boat support. Whenever the shark starts to behave erratically or repeatedly bumping; get on that boat!
4 However comfortable you begin to feel with them don't overstep the mark. They are still wild creatures after all!
Disclaimer: None of the above makes the experience safe, just safer!
All pretty obvious stuff, but I can't stress number 1 enough, and it is with the current research being done that the likes of you and me can go and enjoy the amazing experience of diving with a GWS.
For your info, and in the aim of keeping this post alive, some more GWS freediving movies:
http://www.bwhi.com.au/gwhite_1.htm