Collect the Dark Aether Wrench

So all cylinders of der Wechsler have been activated by either one of the wonderweapon upgrades.

Now proceed by entering the Dark Aether. Head back to the Medical Bay, to the upstairs floor, and interact with the anomality encountered. After listening to a short conversation, leave the Dark Aether and you will find a 'Dark Aether wrench' in the Medical Bay. Interact to collect it.