robot, Mr. Handy, Fallout universe, mechanical arms, silver plating, thruster, repairing shelter, vault door, post-apocalyptic, rust texture, metal patches, dim lighting, underground bunker, pipes, concrete walls, sparks, tool holding, 3/4 view, ambient occlusion, detailed machinery, worn-out decals, emergency lights, sci-fi atmosphere, dust particles, service-oriented posture.