Zwingli-Hochbunker, Military bunker in Walle Bremen, Germany
The Zwingli-Hochbunker is a massive concrete structure in Walle with extremely thick walls, built to provide protection from air raids during World War II. Today the facility serves as a data center and uses underground heat sources for energy.
The bunker was built during the war and provided shelter for around 2000 people during Bremen's heaviest air raid in 1944. After the war the facility was modernized several times, including with new systems in the 1960s and 1970s.
The structure takes its name from Swiss reformer Ulrich Zwingli and shows how Bremen has transformed wartime architecture into modern centers of technology. This shift reflects the city's willingness to repurpose historical buildings for contemporary use.
The facility is not open to the public since it operates as an active data center. From the outside you can observe the massive concrete architecture and understand its role in Bremen's wartime history.
From 1967 onward the bunker was equipped with decontamination showers and specialized filter systems to handle potential nuclear attack scenarios. This retrofit shows how the facility retained strategic importance during the Cold War.
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