# 4 Other research facilities
Well hidden in the forest is the most secretive research work of the Army Weapons Office during the Nazi dictatorship. This uranium enrichment plant was built for the scientific exploitation of atomic energy for a new type of weapon. According to captured secret American documents, this square concrete remnant had a wooden roof.
The uranium project:
The parabolic mirror:
It is still unclear whether an attempt was made to use sound waves as a weapon or whether a tracking system was tested here. There is much to fantasise about with the idea of a sonic cannon.
Traffic test area:
