Interval 06 - Interception
Sayonara, Sucker
Well, it looks like Fettel is somewhere on the research level, and he's looking for Norton Mapes, who apparently knows the location of the "Vault." We're guessing that's where Alma is, but we'll see...
After you meet up with Mapes again, explore the offices just past the checkpoint to find another Health Booster. After a longish sequence of fights, you'll come to what appear to be former research areas that have now been converted by the Replicas into storerooms. If you poke around in the first of these, you'll find a MOD-3 Rocket Launcher. Hoo-ah!
Shortly past that area, you'll come to the security office, where you can override the lockdown. We're pretty sure that every man would like to override a lockdown at least once in his life, so enjoy the sensation. If you head back past the stairs leading up to Mapes, you can find a Reflex Booster in one of the unlocked areas. When you do return to Mapes, though, he'll obviously be preparing to leave the area with all due haste. Head into the room to the left of the elevator and start climbing the ladder there to eventually reach the next area.
Unauthorized Personnel
After meeting up with Mapes at the beginning of this level, he'll try to kill you! He really is a bastard! You can destroy the turret here by slo-moing yourself underneath it and unloading on it with your shotgun. You might also try to attach a sticky grenade to it and detonate that.
Anyway, you'll have to retreat back up into the ceiling to move on; the turret was previously retracted into the ceiling, but since it's dropped, the path beyond it will be available. Unfortunately, there are a lot more turrets in this area. The first one can be shut down by blasting the padlock off a door and shutting off the power, but most of the other ones are just there to kill or be killed. It can be difficult to survive their fire, so again, try to get up close and personal. If you can get underneath them without dying, you've usually got the kill in hand, since they take so long to pivot.
The most difficult turret to kill is in the hallway past where you see Mapes again. It'll have a good length of hall to shoot at you, but if you can get down near the small cart in the middle of the corridor, you'll find a crawlspace leading to its power switch. There are actually two turrets overlooking the next hallway, so as soon as you see them drop down, duck into the door nearby and start crawling through the ductwork to get to them and destroy them before moving on through the crawlspace nearby. Luckily, you'll be past the bulk of the turrets at this point, and will soon start hitting good old-fashioned clone soldiers soon enough. Never thought you'd be happy to see them, eh? There's a Reflex Booster on a table just past the first group.
more grave threat: an EVE, which is apparently some kind of autonomous battle robot. To bring it down to your level, enter the central elevator control room between the two elevators and flip the switch there. It'll ride down the elevator outside your window and immediately open fire with its own MOD Rocket Launchers...if it happens to see you, that is.
On harder difficulties, the EVE is going to be a tough little cookie to take down. You'll be able to find another MOD-3 of your own near this switch, which does significant damage to the enemy, it you can make it stand still long enough to hit it. We found it a bit easier to just get in close with the shotgun, by flipping the elevator switch, then immediately heading to the left. If the EVE doesn't see you, it won't follow you, allowing you to reach the elevator and open fire before it even knows you're around. If you use one of the elevator pillars here for cover, and pivot around that, then you should be able to unload a few dozen shotgun rounds into the EVE while dodging its fire. You can also throw grenades at it if you think you'll be able to hit it. This is a tough enemy to kill, but it can be done with a little smarts. Alternately, you can just try to lead the EVE away from the elevator, then run back and ride up, but it's awfully fast for such a big enemy.
Next up is a toxic leak area. We get the feeling that Armacham will be plummeting on Fortune's "500 Best Companies To Work For" list this year. Anyway, when you reach the switch to turn on the exhaust vents, walk up the steps to reach a Health Booster. Beyond that, you'll find a security station with a turret control system nearby; be sure to hop in and kill as many soldiers as you can with the turret before moving on. It's fun!
Afterimage
There's another Health Booster in one of the offices here, near the one with the flashing answering machine. These Armacham people must've been one healthy lot. You can also get a Reflex Booster, by checking out the operating table in the room past where you see Fettel through the window.
Most of the ensuing fights here are pretty standard, but when you get into the courtyard, be ready for another EVE enemy. This one's harder to kill than the first one, due to the fact that it'll be supported by grunt Replicas, making it hard to strafe around it while unloading shotgun shells into its body. If you still have a MOD-3, you can fire that at long range, try to lure it over proximity mines, etc. You'll need to find some way to take it out if you want to pass through. There's also a small amount of cover near the plants at the top of the small set of steps leading down here; you can duck behind that and pop up and down to fire at it while protecting yourself from its damage.
You'll find a Type-7 weapon on the other end of the courtyard. This is essentially a sniper rifle, but better; any shot anywhere on the body of a Replica is a one-hit kill, at least up until Hard difficulty. You might've also found a Type-7 back near where you fought the first EVE, in a hidden passage, but this one is out in the open and easily findable.