Portal 2: Desolation

ALT Three balloons — two a dull blue, one white — hover near the right of the scene, tied to a stanchion sitting on a walkway out of shot which leads into a test chamber of underground Aperture. One of the balloons has a '50s Aperture logo on it. The environment is rife with large pipes, scaffolding, and filthy metal characteristic of underground Aperture. While the ramshackle test chamber looms high ahead, the scene is otherwise dominated by a leaning tower of gantry adorned with arrays of stadium lights — many broken — which barely cut through the thick dirt in the air to illuminate the enrichment sphere's interior.