I'm so glad I stayed for the full credit sequence, there's an audio after them that sets up the next game - the Overseer is talking to someone who tells him that the base (which he refers to as site 12) and the marker have been completely destroyed and then the Overseer says the other sites can pick up the pieces.
So the Sprawl was just one of many sites in which markers are being built.
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I can't be the only one wondering what the convergeance event was leading up to.
The original game suggested that the Marker neutralized the hive mind's necromorphic properties, but necromorphs wouldn't have existed there previously (it was man made and hidden away on a desolate planet because it was dangerous), perhaps in that instance the problem was that moving the Marker somehow severed the Marker's control over the hive mind, causing it to go... feral I suppose.
Then the question is: what is the Marker supposed to do? It would seem to be a bio-former (like a terraformer except for biospheres).
Jake Meridius Conhale, at your service!
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