video game setting, Black Mesa Research Facility, Half-Life series, abandoned laboratory, dark corridors, flickering lights, vintage computers, scattered papers, broken glass, hazard suit, headcrab, crowbar, Gordon Freeman, action pose, alien creatures, emergency signs, red emergency lights, steel doors, concrete walls, ventilation shafts, 3/4 view, atmospheric lighting, detailed textures, high contrast, dynamic shadows, first-person perspective, immersive environment, science fiction theme.