The "Stasi was the East German Secret Police. This is one of the bunkers built by the East German government from 1968 until the 1980 for fear of another insurrection of the people and of an invasion by NATO troops. The Ministry for State Security decreed building and operation of fall-back shelters in which it would be possible to maintain a "firm, continuous and covered leadership" during times of war as well as domestic or international tension.
The highest secrecy was applied for these bunkers. Internally, planning and operation was carried out under the code name "Filigran" (german: delicate).
Construction on thics particular bunker started in 1972.
UPDATE: New photos from 2015-05-31