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Kaufering concentration camps were a network of subsidiary camps of the Dachau concentration camp.
With the intensification of the Allied air war against German industrial and military enterprises after 1943, the German Armaments Ministry and the Schutzstaffel (SS) agreed to accelerate construction of massive underground factories, using large numbers of conscripted laborers and concentration camp prisoners. Hundreds of satellite camps attached to major Nazi concentration camps were established throughout the German Reich in 1944 and 1945. Inmates were compelled to hollow out the sides of mountains or caves for immense systems of tunnels and factories that would be secure from Allied bombs. Those who survived these tasks were often used to build new weaponry, such as the Messerschmitt Me 262 jet fighter, and V-2 ballistic missiles... See more on http://en.wikipedia.org/wiki/Kaufering_concentration_camp
In Bavaria, two major camp systems, Mühldorf and Kaufering, were set up as subcamps of the Dachau concentration camp. Its inmates provided the labor necessary to build subterranean facilities for fighter aircraft production in the Landsberg area.