The Waterworld contest requires participants to submit photos that feature water in every part of the image, with specific guidelines emphasizing that only objects fully submerged in water are acceptable. Photos can include underwater shots, surfaces of water, or images taken through clear glass, provided the glass is not visible. The contest allows for the inclusion of objects within the water, such as fish or rocks, but anything partially submerged or floating does not qualify. Participants are limited to one submission each, and photos must be original work. The contest will conclude with a voting poll to determine the best submission. Discussions also touch on various water-related photography experiences and the beauty of aquatic environments.