Design a large 512 x 512 underwater...

Design a large 512 x 512 underwater landscape. Focus on the ocean floor with uneven terrain, including sand, rocks, coral, and natural formations. Add strong height variation with slopes, dips, ridges, and layered ground. Create a dense and detailed environment with coral clusters, plants, and organic shapes spread across the area. Avoid flat terrain and avoid any creatures or main subjects. Focus entirely on the environment and natural underwater atmosphere. Make the scene feel immersive, wide, and visually rich.