Generally you get a soft focus effect, and the plastic will not last long at all - put all the gubbins in an ammo can or peli case with padding and a good towel on top. At the photo site remove the gear and snap away before repacking and replacing any damaged bags, which if they are wet should be scrapped (and taken out separately of course) and replaced with new before repacking. Results will be mediocre unless you invest in a waterproof camera (eg Nikonos), and active water will look very solid unless you can get flash bulbs for a longer burn and a smoother, silkier effect. Good luck!