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Posted by: T13
Posted by: MegaMuffin16
I think the Forerunner put them in some sort of cryo-stasis, and the Covenant unleashed them. Whether it was by accident or design is unknown.
I seem to remember Guilty Spark saying something about the Flood being kept for research or something.
Yes, it's in The Library:
Why naturally the Flood is simply too dangerous to release, and mass sterilization protocols may again need to be enacted. Of course, samples were kept here after the last catastrophic outbreak...for study. It seems... that decision may have been an error.
[Edited on 12.20.2010 8:32 PM PST]