- last post: 01.01.0001 12:00 AM PDT
I don't know if that is what you're referring to but the whole thing looks like a Flood Library buried in the sand to me... I do hope it's not though, unless they make the Flood more fun to battle than just a shotgun onslaught this time around.
The guys at the Halo wiki (www.halopedia.org) seem pretty convinced and definite about it being the Ark. Just do a search on 'ark' and you'll find a pic from the Halo 3 trailer.
[Edited on 5/10/2006]