Desert Dunes Inside an Underwater Cave

A hyper-realistic 3D render of an underwater cave that hosts a vast desert of wind-sculpted sand dunes. Crystal-clear turquoise water bathes golden sand; light beams pierce the surface, casting caustic ripples and soft shadows across ripples in the dunes. Surrounding cave walls are rough limestone with stalactites and coral growth, bookending the dune sea. Gentle particles float, bubbles rise, and ray-like beams reveal depth; the composition uses a wide-angle perspective, crisp micro-details of sand grains, and volumetric lighting to emphasize the surreal contrast between a dry desert and an aquatic cave.