A round, large, brutalist concrete manhole embedded in tall grass, sealed and closed, resembling an atomic bunker. The manhole has embossed writing on the side, appearing clean and new. Brutalist style with details including rings made of tantalum carbide, tungsten, zirconium oxide, and metamaterials. Diffuse sunlight and natural shadows fall across the surface, enhancing the textures of the concrete. Highly detailed, realistic, with intricate material rendering. --ar 16:9