Located

We have found the location of the garrison! Not long after the radio-isotope long range scanner was installed, it read a huge signal, and pointed us to a biochemistry research facility at the edge of the ecosphere hangar, off the main passage connecting it to the Grand Hall. 

In retrospect, it is an logical spot to stay in this abandoned city. It is easily accessible from the Grand Hall where you can land your ship, and it is next to a source of food and water, making it rather autonomous for a long time. Moreover, the forested area provides a good space to have a relaxing walk, or exercise a bit. And, being a research facility, it is easy to seal it off or guard its entrances.

The entrance has been forced open, so we have not been the first visitors after the Tetrimon left from their garrison. Perhaps Sansha or Blood Raiders? They are seen often enough outside Mezagorm, even last week. 

A cautious first look reveals that the place has indeed been thoroughly ransacked. We'll continue to explore it more systematically tomorrow, but it is very disappointing, as probably we will not find much of value.