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Visitors look at an air supply tunnel in Lucerne's Sonnenberg nuclear fallout shelter September 12, 2006, built from 1971 to 1976, which was to be a safe haven for 20,000 local residents
Gosen, Germany. 06th June, 2019. The main air supply system of a V2C type bunker. Almost 30 years after the fall of the Berlin Wall, a former GDR state security bunker is
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