Micheala asked about cheaper underwater cameras than the Go Pro 2.
As some others within the group may want to film underwater I thought that these links may be useful.
Go Pro 2 : The new go pro 2 is around £262 from Amazon uk
You can still buy the original HD Go Pro for about £184 :
Another Camera that I have found that has good reviews is:
ContourROAM Waterproof HD Action Camera it is about £146 :
To Shoot at more than just a few feet underwater this camera needs a case which is about £32 : This brings the total to around £184
The other option is to buy a waterproof case for your own camera or mobile phone. These can be soft cases and work well up to a few meters underwater:Cost from £20 – £50