Design only the ocean floor surface...

Design only the ocean floor surface within a 512 x 512 area. Do not create any walls, borders, boundaries, or enclosed structures. Focus strictly on ground terrain: sand, rocks, coral, and natural formations. The terrain should be uneven with slopes, dips, and layered ground. The build should be open and continuous in all directions, like a natural seafloor. Avoid any vertical perimeter structures. Focus only on the surface.