This was the largest "Lost Place" I have visited until now.
Construction began in 1936. In the secret position plan of the "Reichsamt für Wirtschaftsaufbau" (The Reich's Agency for Economic Development), the facility was recorded at the beginning of 1939 under the code name "Friedland" as one of 87 existing production facilities for explosives, combat agents and ammunition.
The facility was walled with barbed wire. It was an area of about 580 acres with 399 buildings. Next to a factory railway with a length of 17 kilometres they had an extensive road network on the premises.
Three brown coal power stations with an electrical power output of 4.400, 3.000 and 1.200 kilowatt hours were built to ensure the elctric supply.
These were supplied from a high-rise bunker which in turn was directly connected to a nearby coal mine via cable lift.
The generated electricity was transformed and distributed in 20 transformer stations.
In addition, there were emergency generators for the main production buildings.
There is an enormous water demand for the production of explosives. To secure that, five deep wells were drilled, a cooling lake and two elevated tanks were built and two pump stations were constructed.
The facility had one drinking water network and two industrial water networks.
Five seperate sewer networks conveyed the raw acidic sewage directly into a nearby river until 1941 a neutralization plant was completed.
For the production and recycling of the chemicals needed for the production, a denitration and concentration plant for sulfuric acid was built, as well as an acid cleavage plant for the production of Oleum (highly concentrated sulfuric acid).
This is enough information for now, more will follow, but here are some pictures for you.