A breathtaking photorealistic underwater scene capturing a scuba diver equipped with a mask and breathing regulator, surrounded by a vibrant array of large, colorful tropical fish. The diver is immersed in a crystal-clear ocean, illuminated by rays of sunlight filtering through the water's surface, showcasing intricate details and vivid colors reminiscent of National Geographic photography. The image is in ultra-high definition, featuring a balanced vertical composition that enhances the diver's sense of exploration and the ocean's vastness. Gentle swirls of bubbles trail from the diver's exhaled breaths, creating an ethereal atmosphere in the tranquil underwater world.