I found a weird very dark room with brick arches in the middle of the building. My very wild guess is it was for cleaning of the cotton used in the spinning process. Rusty metal plates with big round holes in them make up the ceilingj

Brick arches room

And a ladder

I thought I heard someone walking around in the building, so I tried to walk more quietly. Of course later I found out it was dripping water.

Right next to the brick arches room

In the eastern side next to the toilets I found a switch and fusebox of the heating system (Klimaanlage)

Fuses and switches

Spring sunshine

"Unbefügter ist dat Betreten des Kesselraumes verboten" (Entry of the boilerroom is forbidden for unautherised people). Ooh, now I'm scared.

Kesselraum (boilerroom) sounds more impressive than it reallly is.