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In preparing for my upcoming campaign start I have been reading thru the SR4 book as well as notes from old games and I got to thinking. What has happened to the Arc after the Shutdown and Deus getting loose? I don't remember seeing anything about it in my reading.
It became social housing in parts, in parts it is still derelict (Seattle 2072). Before, it was the site of a number of seasons of the reality horror show Survivor: Renraku Arcology, which is pretty self-explanatory (SOTA 2063). On it's roof, there is an independent Beta clinic for the brave or desperate (ChromeFlesh), that once was a Renraku Delta clinic.
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In my game, it is also a source of some of the early CFD in Seattle.
That actually makes a lot of sense. And since you can shut the arcology down, containment can be attempted, and maybe everyone inside can be killed with Green Ring or something.