This tutorial isn't one of mine but I've been wanting to try this for a few years now and I recently found this on Videorays site. It's basically how to make a cheap submersible video camera with out a housing. It looks pretty easy to do and while they do have a Materials List not everything on it is current. (such as the camera, Supercircuits no longer sells that model.) I haven't actually gotten around to trying it my self but I have everything needed to do it so there will be updates on this in the near future.
Just click on the above picture to go to their site and read the tutorial.