The purpose of this contest is to gather photos of an often underrated (and sometimes misunderstood) category of photography. It will also serve to stimulate land photographers to explore a medium other than air. The submission period will allow people to post photos and go back to the sea (or swimming pool, river, lake, pond, tub) to try different techniques.
The camera setup is not important, from housed high-end digital to single-use disposable cameras, everything counts. And you don't need to scuba or even snorkel.
Try marine life, try portraits, try nudes, try landscapes (or seascapes), macro, micro, wide angle, natural light, artificial light, IR light.
Bottomline: experience underwater photography.