video game, Half-Life: Source, first-person shooter, protagonist Gordon Freeman, HEV suit, crowbar, headcrab, alien creatures, Black Mesa Research Facility, complex machinery, industrial setting, dim lighting, emergency lights, flickering, steam pipes, metal walkways, computer terminals, hazard signs, security doors, scientific equipment, ventilation shafts, concrete structures, 3/4 view, atmospheric lighting, high-resolution textures, realistic physics, enhanced water effects, dynamic shadows, action pose, immersive environment.