- last post: 01.01.0001 12:00 AM PDT
One thing we can be sure of, the big dome thing is Forerunner, it's doing SOMETHING and Chief is watching while Cortana is off on High Charity being questioned by The Gravemind.
What I think is that the giant dome is the Arc that 343 Guilty Spark mentioned.
All of the 7 installation (minus the one that exploded) are on standby because Sarge, Miranda and The Arbiter managed to kill Tartarus and remove the index from the core seconds before the weapon went off. 343 mentioned that the countdown can only be restarted from the Arc. We don't know where the Arc is but the way Halo 2 ended we assume that it's on Earth. We can then assume that the giant dome is the Arc.
The crater was probably caused by Regret's ship jumping into Hyperspace from the city center.
But I don't see how a dome that big can go undetected... that's a little confusing... if it was in the artic, maybe but not Africa.