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The "Emergency Seat of the Federal Constitutional Organs for the State of Crisis or State of Defence to Maintain their Ability to Function" was a Cold War underground bunker complex, 25 km from the seat of the West German government in Bonn, designed to allow the continuity of the government in the event of a nuclear war. Being used in NATO exercises, it became redundant after the end of the cold war, with most of it being gutted.
Apollinarisbrunnen