Perfect Dark Zero Walkthrough and Strategy Guide >
"The Brothers" are on the opposite side. Locate some steel crates in (directly behind your starting position) and take cover behind them, as the Brothers will shoot straight through the wooden crates. From the protection of the steel crates, choose one brother, use your Pistol scope to find him, and start shooting. Aim for the head and hit it several times to take him down. When he does go down, focus on the second brother and eliminate him. If you run out of P9P ammo, switch to your UGL. You don't have the scope, but it still does the job (and there's UGL ammo all over).
Be warned, the Brothers may toss a Laptop Gun (or two) on one of the side walls, which will do a lot of damage. Look out for these guns and take them out immediately. CHECKPOINT.
A bridge will extend, connecting your side to the side of the fallen Brothers. If you want, before you cross, smash some of the crates for ammo and the Hawk Boomerang, which does come in useful. When you're ready, run over to the other side and look to the top of the staircase to the left. A couple of enemies will be making their way down. Eliminate them, along with anyone else who comes through the door. When the shooting stops, move up the stairs and pass through the door.
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Depending on how many guards you just eliminated, there may or may not be someone waiting for you here, so be prepared to defend yourself. Pass through the door to the right (again, there may or may not be enemies). Approach the console and hack it, if possible. This will provide you with the completion of an objective you didn't even know you had, Support: Pinpoint Dr. Caroll. This will also provide you with a line of waypoints straight to Dr. Caroll.
Ride the elevator up, then arm the UGL and open the door to your left. Toss the gun into the room with "RB". Next, with your Pistol, shoot any one of the three men in front of you. This will draw the others in the room to the UGL, which will blow. Clear out anyone who lives, then enter the room. Be aware, your actions may have gotten the attention of a Sniper on the outside catwalk below you and to your left. If he's shooting at you, take him out immediately. If he's not, don't worry about him. Run to the locker at the opposite side of the room, collect the Falcon from it (drop what you want to collect it, I opted to keep the Boomerang), then move down to the lower level and out the door to your right, so you are on the aforementioned catwalk. Slowly move around the corner, as that Sniper may be there waiting for you. If he is, take him out with your Falcon. If he's not (and you didn't shoot him before), be careful, as a Sniper from below is probably shooting at you.
From what I found the first time through, there will be a Sniper out on the catwalk, and two in the area below. If you look out to the area below, you'll see large orange cylindrical structures, two to your right and four to your left. One Sniper will be atop the rim of one of the two cylinders to your right, most likely the one farthest from you. The other will be on the ground, between the two orange cylinders farthest from you to the left. Now, I say, "first time through", because this all changes as you play through time and time again.
If the snipers are not in the aforementioned positions, look in the following spots: The upper rims of each of the cylindrical structures, the tops of the control towers between them, on the ground at the base of each one, and on the short staircases near the square movable platforms. And, note, if one is not on the catwalk with you, there will probably be three on the ground.
Once you've cleared the snipers out, move to the left corner of the catwalk and use the above Zipline. Once on the platform, follow the waypoints and pass through the open door to your left. Enter the elevator and ride it down.
When the elevator arrives at its destination, move out and eliminate the two men to your right. I suggest using your Jackal against them, as it takes them down with one shot. When they're dead, collect the dropped CMP150 and a P9P, if you don't have one on you, then move down the left hall. Here there are two potential options, waypoints that move past the elevator, and waypoints that stop at the elevator. Let's deal with those that move past the elevator first.
IF THE WAYPOINTS MOVE PAST THE ELEVATOR:
Continue past the elevator and to the doorway leading the next large room. Use your P9P to take out the security camera attached to the large beam ahead of you and to your left. Next, look to the beam behind it and you'll see another camera. Shoot it. Let the waypoints guide you straight past these beams, then under the ramp and to the open doorway on the other side. Shoot the guard, then move down the hall.
Shoot your way down the spiral ramp, then put away your weapons and follow the waypoints through the many doors and down the ramp to Dr. Caroll. Speak to him then follow him as he leads you to the final destination, the Lab. It's that easy.
IF THE WAYPOINTS STOP AT THE ELEVATOR:
Enter the elevator and ride it up. Shoot those at the top, then follow the waypoints down the right hall, then down the hall to your left. Hide your weapon before moving through the door at the end of the hall, then pass through the door to the right. Here you'll find Dr. Caroll. Speak to him, then follow him as he leads you to the lab.
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Dr. Caroll will pass the elevator you rode up, then he'll enter a large room with many security cameras (same room mentioned above, you're just entering from the top floor). As Dr. Caroll runs forward, shoot the camera above the doorway in front of you with your silenced P9P. Run into the next room and prepare for a little battle. Shoot the mechanic, then wait for others to enter the room from both doors. Pick them off as they do. When the stop coming, take cover at the doorway and look for men hiding across the way. Take them out, then destroy the security camera directly above you.
Follow Dr. Caroll into the next control room and continue to shoot your enemies. Upon exiting through the next door, look left for the security camera and blow it up. Follow Dr. Caroll down the ramp, then make a right U-turn and move down the next ramp. At the bottom, move through the open door to the left, then put away your weapons and follow Dr. Caroll as he leads you to the lab. If, by chance, a scientist triggers the alarm, arm yourself as you'll run into a few guards before you reach the lab. Take them out, then follow Dr. Caroll to safety, and mission completion.
THE THIRD OPTION:
After playing through this level countless times, the game laid down a different path to Dr. Caroll. If this is the case for you, just follow the waypoints to Dr. Caroll. I'm not going to provide a walkthrough for how to get to there, as the waypoints will guide you there beautifully. Also, I have the feeling that this third option only comes into play after you've played through the other two options a few times. By this point, you should be able to take on the enemies/cameras/snipers/scientists like a pro.