Well, I tried the pool noodle gambit, and it didn't work too well. As some of you have surely guessed by now, I found that the stuff crushes with depth, and there goes your buoyancy. So, it looks like I will have to use some kind of non-compressable foam for this. I saw some material in an old archive about Diviny(?) foam sheets cut to fit and bound in place, but then I saw the StiX flotation belts, that are strapped around the lens housing on your camera. Hmmmm, I thought. I wonder if this would fit around the lens port on my Ikelite housing for my G10? And would it get in the way of the camera's functioning? The lens port seems to be blocking everything on the front of the camera already. The StiX belt seems to be made for a much larger lens port than the one I have, but it seems to adapt in size? Anyone here tried this little gimmick?