Fluidr / Filter chamber in Schoenenbourg Fortress by Dannis van der Heiden

Filter chamber at a depth of approximately 30 meters below ground level for the mechanical ventilation of the fort. This would be very necessary in an enemy attack with poison gas grenades.

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This photo was taken in: France > Grand Est > Bas-Rhin > Arrondissement de Haguenau-Wissembourg > Schœnenbourg

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