Idea: Underwater Photography

This is not an idea that I would be able to carry out now, in the winter, but I have been wanting to try underwater photography in the summer. I have been enjoying using disposable cameras lately, and there inexpensive waterproof disposable cameras available. I like the way bright colors contrast with the blue of a swimming pool. I also think underwater photography has a very dreamy, ethereal mood to it, which I would like to try and capture.