underground bunker 3d model

3D model prompt: Game-ready asset of a modular underground brutalist military bunker complex. Key elements to generate: heavy armored blast door with manual mechanism and security turnstile (entrance), sections of multi-level structure with concrete stairs and ramps, functional room blocks. Interior areas included in texture/form: command center desk, server racks, bunk beds, metal lockers, diesel generator, ventilation filter units, battery banks. Connecting modules: hallways with exposed pipes, electrical conduits, metal cable trays on ceiling, fire hydrants. Aesthetic: Brutalist architecture, reinforced raw stained concrete, rusty metalwork, worn surfaces, highly detailed industrial textures. Clean geometry, no small debris, non-overlapping UVs, modular composition for tactical FPS level design. --textured --low-poly-style