
Two, why doesn't GLaDOS move said air ducts and back rooms to try and get you during Portal 1 when you've escaped? One, why do the air ducts and back rooms even exist? However, in the sequel, we see that it is, more or less, a giant collection of disconnected rooms that can be moved at random, to fit whatever GLaDOS or whoever chooses. In the original Portal, the Aperture Science Facility seems to be a normal building (solid, in other words, and in no way, shape, or form, mix and matchable).Building an abandonment hatch years before actually needing to use it. Another one of Aperture's bizarre ideas, presumably.If the shaft was abandoned in June of 1961, why was Aperture still constructing test chambers in it at least twenty-five years later? Sphere 6 has two dates on different parts of the interior wall surrounding the conversion gel pipe, 19 one assumes the four-year construction time for the relatively simple test area was due to Aperture's financial difficulties. Pump Station Gamma is dated 1982, while the offices immediately after are dated 1981. Immediately after exiting Sphere 5, you're looking at a wall marked 1978. But Pump Station Beta is dated 1971, ten years after the shaft was supposedly abandoned. The first three test spheres are dated 1953, 1957, and 1958, respectively.

The area just beyond that, with the foyer and the elevator tower, is dated 1952. The abandonment hatch to Test Shaft 09 Zulu Bunsen is dated 06 15 1961. After Wheatley throws Chell and PotatOS down the shaft, we start to encounter dates painted on the walls presumably these are the construction dates for various parts of the old facility.
