Hidden Lagoon Coral Reef: Photoreal Underwater Paradise

Photorealistic underwater panorama of a coral reef in a secluded lagoon. Clear turquoise water with sunbeams slicing through, illuminating vibrant coral formations—brain coral, elkhorn, staghorn, and delicate sea fans in bright reds, oranges, pinks, and yellows. A lush carpet of small polyps, sponges, and seagrass covers the reef floor, with patches of white sand. A school of tropical fish (parrotfish, angelfish, clownfish) softly swirls around, and a calm sea turtle glides above the reef. Overhead, a hidden limestone cave entrance and cliff arch hint at secrecy. Realistic water refraction, tiny bubbles, and micro-textures on coral, all rendered in 8K photorealism with cinematic lighting. Mood: serene, untouched, tropical paradise.