A test infantry fortification built in 1936 by the Czechoslovak military. After resiliance and weapon tests were completed, it was used as a training bunker for bunker crews, that were trained to man the fortifications on the border. It was then also tested on by the germans during WW2.
After WW2 it returned back to it's original role as a training bunker, up until the 1980' - 1990'. There used to be a small group in the 2000', that tried to reconstruct the inside, but after the equipment got robbed, the bunker was permanently shut and sealed, in which state it remains to this day.