Underwater Rainbow — 3D Rendered Scene

Ultra-detailed 3D render of an underwater scene featuring a vivid rainbow arching through the water column. Sunlight streams from above, creating volumetric light beams and caustics dancing on a sandy seabed and colorful coral formations. The water is crystal clear with tiny particles and bubbles. Foreground shows a glossy wet rock, while a school of small silver fish glides by. Refracted rainbow due to light transmission in water, with realistic materials, ray-traced reflections, and depth of field. Cinematic, photoreal style.