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From 1895/96, the "Allgemeine Elektricitäts-Gesellschaft" (AEG) built a large machine factory south of Humboldthain, which was expanded into a real factory town under the design of well-known architects such as Franz Schwechten and Peter Behrens. In order to connect the equipment factory on Ackerstrasse, a 295-meter-long tunnel was built, through which electrically powered trains transported workers and materials back and forth between the two locations from May 31, 1897. New means of transport were in demand at this time. Siemens proposed an "underground railway", while AEG favored an underground tube railway based on the London model. Ultimately, Siemens initially prevailed with the cheaper concept of an elevated railway. However, AEG continued to use its tunnel internally and for testing purposes. Around 1910, the eastern tunnel ramp was demolished and the tunnel extended into the basement of a new building. During the First World War, the tunnel was used for munitions production, and during the Second World War it was used as an air raid shelter for employees. In 1984, the site was finally closed by AEG. On the eastern half of the site, an investor had almost all of the historic buildings removed in order to set up his production in a modern glass palace. The remaining factory buildings, which are now listed, house a start-up center and a technology park. The underground structure itself was inaccessible for a long time and was partially under water. But since spring 2016, the association, with the support of the owner, the GSG, has repaired the structure and uncovered the historic track again. Our visitors first receive an introduction to the historical development of the site before exploring Germany's first underground tunnel, which has also been the filming location for the well-known TV series "Babylon Berlin" twice. The "AEG Tunnel" is a location on the Berlin Industrial Heritage Route.