A bunker containing an artesian well that served as the water supply for the complex. The so-called source (brunne) with filter installation.
In this bunker, water was stored in two 1,700 liter tanks. Before the water was pumped into the tanks, it had to be filtered. The water ran through two filters, the coarse- and the sand filter. Unfortunately, the pumped water turned out to be brackish and could not be drunk.
A reservoir (trinkwasser-behälter) was built on the complex, which was supplied with fresh water every day from the headquarters by horse and carriage. One of the two tanks that was removed from the bunkers through an opening in the roof was located in the trinkwasser-behälter.
The remaining tank was probably blown up with a hand grenade, but is still in place. The well has been shut down and decommissioned. The filter installation is still completely present in the bunker.