I've done this trip twice so far and it has been an amazing experience; I loved being able to use my diving to contribute to conservation work. Not only do you get to dive a world-class area on the biggest and best liveaboard there, but your costs go to covering the expenses of the researchers, allowing them to perform the work. Divers are encouraged to help the researchers, but it is not at all required. You can help save Cocos while diving there! Plus, costs can be tax-deductible, at least in the US. And just in case that isn't enough, September should be prime season for seeing hundreds of schooling hammerhead sharks.
More info is here: http://seaturtles.or...cle.php?id=1703.
Just to get you in the mood, I've included a few photos from my March trip below.
-Gina

hammerhead in blue by g-na, on Flickr

todd and his turtle by g-na, on Flickr

hammers and mooring line by g-na, on Flickr

receiver retrieval by g-na, on Flickr
