On Patrol the Plaguelands, you can actually access the same SIVA Replication Chamber you blow the -blam!- up in the last mission, entitled "the Iron Tomb". Why? Why can you get into this place? By the way, you can only patrol the Plaguelands AFTER this mission. From the very moment you descend into the Replication Chamber, something is amiss. The doors that seal after you escape the detonating bomb are open. For what reason? Design flaw? There are no enemies in the Replication Chamber. Probably because you detonated a bomb in there. You can see everything in there that you would in the Iron Tomb besides the dead bodies of Jolder, Felwinter, and Gheleon; there is also a lack of iron braziers. It's unnerving. [spoiler]I wonder why we can enter the Replication Chamber... Exotic, for all those who watch for this stuff?[/spoiler]