I was curious about the size of the Thargoids Sites and if / how there are differences between them, so I took pictures of the ones I visited from about 5000m altitude. Most of the sites I pictured were located on the dark sides of the planets / moons, but the one on Mel 22 Sector NX-U D2-31 3 A wasn't. Ground features of the site, now clerly visible by its shadows, seemed to indicate that some structures of the site are now missing. Here is what i mean:

(Click on the image for more)
So I think the scavengers are not repairing these features, rather the opposite is true: they are doing what their name already suggests, recycling the materials these structures are made of. And I don't think that the Thargoid sites were constructed at the locations were we find them today, they were grown someplace else and then placed at their current locations. After that their propulsion system was not needed any more and the scavengers are still working on the task to disassemble them (or rather digest them, using the green goo as some kind of digestive enzyme).
Also this might explain the function of the Thargoid Device inside the central structure of the sites. This room used to be the control room and the device was part of the navigation system needed to fly the structures to their final locations, quite similar to the navigation systems in our ships and the galactic map that comes with it.
If this is true (and I'm pretty certain to be not to far away from the truth), the diagram hidden in the messages of the Thargoid device might be something like echoes of the last course settings, all these ships had in common: from the place where they were grown to the central star system of the area where they were intended to settle. I would not be surprised at all, if we could find a large breeding facility, the Thargoid equivalent of a shipyard, in Col 70 Sector FY-N C21-3, when we finally get access to the system some day.
To me it seems that Thargoid ships and Thargoid Ground Sites do not only resemble some jellyfish found in earth's oceans in their outer appearance, but at least the ground structures do have a comparable life cycle (just in reverse). It might even be possible, that the Thargoid ships we encounter in NHSS's are a juvenile form of its species, while the ground sites are adults or their old ones and there is something in between these forms that we haven't seen yet (that would make the Pleiades Nebula their 'home for the aged').
(https://en.wikipedia.org/wiki/Jellyfish#Life_history_and_behavior)

(Click on the image for more)
So I think the scavengers are not repairing these features, rather the opposite is true: they are doing what their name already suggests, recycling the materials these structures are made of. And I don't think that the Thargoid sites were constructed at the locations were we find them today, they were grown someplace else and then placed at their current locations. After that their propulsion system was not needed any more and the scavengers are still working on the task to disassemble them (or rather digest them, using the green goo as some kind of digestive enzyme).
Also this might explain the function of the Thargoid Device inside the central structure of the sites. This room used to be the control room and the device was part of the navigation system needed to fly the structures to their final locations, quite similar to the navigation systems in our ships and the galactic map that comes with it.
If this is true (and I'm pretty certain to be not to far away from the truth), the diagram hidden in the messages of the Thargoid device might be something like echoes of the last course settings, all these ships had in common: from the place where they were grown to the central star system of the area where they were intended to settle. I would not be surprised at all, if we could find a large breeding facility, the Thargoid equivalent of a shipyard, in Col 70 Sector FY-N C21-3, when we finally get access to the system some day.
To me it seems that Thargoid ships and Thargoid Ground Sites do not only resemble some jellyfish found in earth's oceans in their outer appearance, but at least the ground structures do have a comparable life cycle (just in reverse). It might even be possible, that the Thargoid ships we encounter in NHSS's are a juvenile form of its species, while the ground sites are adults or their old ones and there is something in between these forms that we haven't seen yet (that would make the Pleiades Nebula their 'home for the aged').

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