These shelters were mainly constructed by forced labor from the Arbeitslager Reichenau in Innsbruck. 25 underground shelters with a total length of 11.2 km and space for 28,755 civilians were built in 1944.
These shelters were primarily built by forced labor from the Arbeitslager Reichenau in Innsbruck. 25 underground shelters measuring a total of 11.2 kilometers and capable of accommodating 28,755 civilians were constructed in 1944.