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Test Shaft 09, codenamed "Zulu Bunsen," is the last in a group of nine Enrichment Shafts located in the salt mine above which the modern Aperture Science Enrichment Center is built. Reaching lower than 4375 m up from the deepest parts of the mine, it is the main location of the Portal 2 chapters The Fall and The Reunion. Test Shaft 09 can be considered as a "timeline" level, as it reveals many details about Aperture Science's background and evolution, from its establishment in the late…
