Über Concrete is a special type of super concrete designed by the ancient society known as the Da'at Yichud to build structure as hard as steel.
According to Anya Oliwa, Über Concrete is the essential building block of the Nazi Regime, being based on Da'at Yichud technology and being almost perfect. The only weakness of the substance is that it deteriorates over time and, related to this, starts forming mold, which causes people to develop some kind of allergic reaction or become sick. This is seen in several guards in Eisenwald Prison. Though some Nazi citizens realize that something is amiss with the material, most citizens just shrug it off, believe that it's just a coincidence or blame it off of "unhealthy living" in cities such as Berlin.
Wolfenstein: The New OrderEdit
The mold on the concrete eventually led to the discovery of Set Roth who was in Camp Belica tampering with the mixture of the substance. The substance that caused the mold was from the use of a limestone that exists only in Northern Croatia.
This discovery led to the Kreisau Circle to send B.J. Blazkowicz to Camp Belica in order to find Set Roth and break him out of the camp. This of course would supply them with an advantage they would need in order to launch an all out counter offensive against the Nazis.
In the mission to find Set Roth; it is therefore shown that the substance is produced in Camp Belica, where they also mine for limestone.
Wolfenstein: The New Colossus Edit
In 1961, Set Roth's sabotage of the formula of Uber Concrete bears true fruit since the majority of Nazis's structure built by Uber Concrete has now begun to break down causing major damage and the Nazis are unable to figure out why.