Create an underwater coral-reef explainer scene in a clear cutaway style, featuring branching coral, a sea turtle, clownfish, sea grass, a reef-cleaning station, and layered blue water above a sandy seabed. Arrange the organisms in readable depth bands, use turquoise, coral pink, saffron, and midnight teal, directional sunbeams from the surface, and spare callout spaces without any written labels. No text, no watermark.