Gorilla in an Underground City: a 3D render

An ultra-detailed photorealistic 3D render of a colossal gorilla standing in the center of an expansive underground city carved into living rock. The scene glows with bioluminescent panels and neon signage along damp metal catwalks, steam vents, hydroponic terraces, and rusted rails. Wet stone textures meet gleaming chrome and glass, with reflections in scattered puddles. Dramatic low-angle wide-shot to emphasize scale, cinematic lighting in cool blues and warm ambers, volumetric fog and drifting dust motes. Foreground gorilla is razor-sharp while the cavern metropolis recedes into the distance.