Who knows? Singularity seems most likely, but something doesn't feel right about it.

[Shepard hates that sense of intuition; it's so often right, and so often terrible.]

Discipline in the army's gone to shit; everybody's nervous. One mistaken weapon's discharge... [It had better damn well be mistaken] ...Mob mentality takes over. Great time for an ambush, I have to say.

Whenever we all get back to civilization, I'd bet there'll be war starting up over it.