The Aperture Science Extended Relaxation Annex, referred to by GLaDOS as the Human Vault, is a huge sealed area in the Aperture Science Enrichment Center, housing hundreds of Test Subjects in long-term relaxation from the vintage era. Its only entrance is through the unnamed Co-op Test Shaft. This section of the Enrichment Center is the last location in Portal 2, visited by ATLAS and P-body as their main objective from GLaDOS in Test Course 5: Mobility Gels.