Underwater Stone Chamber with God Rays and Tropical Fish

A 10-second vertical portrait video (9:16). A completely dark underwater stone chamber, pitch black surroundings. At the very top center, a square opening (like an underwater skylight) reveals the bright water surface above. Volumetric god rays, soft, visible pillars of golden-white sunlight, stream down through the square hole into the total darkness below, illuminating the center of the frame. Inside the light beams, a school of vibrant tropical fish swims in slow, graceful, synchronized motion, mostly bright orange, golden yellow, and red-orange, with a few cyan-blue ones. They appear to "fly" weightlessly through the dark void, glowing softly against the blackness. Their movement is calm, fluid, almost hypnotic. The chamber floor is made of irregular dark rocks, gently lit by the light shafts. Soft caustic light patterns (rippling, dancing water-refraction patterns) shimmer subtly across the stone floor. Camera: perfectly static, locked-off shot, no movement, no pan, no zoom. Symmetrical centered composition. The square light opening is at the top center, fish occupy the middle, rocky floor at the bottom. Style: ethereal cinematic, dreamcore, soft aesthetic. Extreme high contrast between pure black darkness and soft volumetric light. Color palette: deep teal and dark navy blue as the base, contrasted with glowing warm orange-gold fish. Premium AI-generated cinematic look. Minimalist, meditative, surreal. Mood: absolute serenity, peaceful, nostalgic, magical. Like a visual lullaby. No tension, no drama. Pure tranquility. No text, no subtitles, no watermark, no UI elements. Silent only the faintest ambient underwater sound if any. Photorealistic, 4K quality, shallow depth of field on edges.