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Excursion to the Ofenkaulen, the trachytuff mine of Th.Rings, which later housed the underground relocation of Schlammpeitzger. The companies Aerostahl and Klöckner Deutz Feinbau Deckel built injection pumps there. The pumps were used for the BMW 801 engine that was installed in the Focker Wulf fighter plane. www.nrw-untertage.de Music: Ocean Floor by Audionautix is licensed under the Creative Commons Attribution license (https://creativecommons.org/licenses/...). Artist: http://audionautix.com/