Ultra-realistic cinematic underwater scene viewed from a low-angle ocean floor perspective, close to the foreground corals and seabed, focusing on a weathered vintage astronaut helmet resting abandoned underwater. Only the helmet is present, not the rest of the suit. The helmet is heavily aged with scratched metal, rust, corrosion, algae growth, barnacles, intricate mechanical details, and worn bronze textures. Its large curved transparent glass visor dominates the composition, covered with tiny water droplets, subtle scratches, realistic reflections and refractions, with floating air bubbles trapped inside. Inside the empty helmet visor swims a single vibrant clownfish, bright orange with white stripes and black edges, positioned near the center and appearing larger due to the close camera perspective. The interior of the helmet remains empty, enhancing the surreal minimalist mood. Behind the helmet, a massive great white shark emerges from the deep blue water with jaws wide open, appearing as if attempting to bite the helmet. Two additional sharks swim far in the distant background, partially obscured by atmospheric haze and fading into the dark ocean depths. Foreground filled with colorful soft corals, reef formations, pink and beige coral branches, sea plants, swaying underwater vegetation, and textured rocky seabed elements surrounding the helmet. Soft volumetric sunlight rays penetrate from above through deep blue ocean water, illuminating suspended particles, floating sediment, micro bubbles, and subtle underwater caustic light patterns across the visor and ocean floor. Photorealistic underwater photography, cinematic composition, dramatic tension, shallow depth of field, atmospheric perspective, hyper-detailed textures, realistic marine lighting, Unreal Engine 5 realism, HDR, ultra sharp focus on the clownfish and helmet visor, soft blurred distant background, National Geographic underwater aesthetic, 8k cinematic render.