post-apocalyptic setting, underground metro tunnels, Moscow, atmospheric lighting, dimly lit scenes, gas masks, rugged male protagonist, military gear, makeshift weapons, mutants, survival horror, tense atmosphere, first-person perspective, dilapidated structures, rusted trains, eerie shadows, 3/4 view composition, detailed textures, grimy surfaces, ambient occlusion, high contrast, dynamic shadows, desolate environment, abandoned stations, immersive experience, enhanced graphics redux, improved character models, reworked lighting system, enhanced particle effects, updated game mechanics, stealth gameplay, narrative-driven, environmental storytelling, claustrophobic spaces, intense combat encounters, survival elements, resource management.