Mission 1: Arkangelsk
Part I: Dam

You start off around a corner. Move forward and to the left, where a guard is standing. Just walk up to him and shoot him with the silenced PP7. Now, collect his KF7 soviet, move onto the bridge, and zoom in to a guard standing just right of the watchtower. Peg him in the head, and move towards the left side of the watchtower, trying not to alert the guards in the tunnel. Walk up the steps, kill the guard there, and pick up the Sniper Rifle. Now, go to the ledge, use the aimer and press C Up to zoom in even further. Pick off the two guards, and head down to collect their ammo.

Go along the tunnel until it goes around a corner, and use the Sniper's Rifle to quickly pick off the guards standing far in the distance. One should come from the watch tower, and he is the closest. There should be one standing behind a pile of boxes, and two hiding in the small bunker. Kill them all. When there is no one left, proceed to get their ammo, and ascend the stairs to the watchtower, where in Agent and Secret Agent mode there should be some body armour! Go back down, and hit the red button near the large door. Go through, and hit the next button. Get your Sniper's Rifle ready if you already haven't, and be ready to kill the green guy in the distance, as he will go and set off the alarm. Then switch to your KF7, and shoot the guy near the watchtower. Check for any more guards (there shouldn't be any), and move to the building. In Secret Agent, you need to destroy all the alarms, so shoot the alarm panel, moving back so the explosion doesn't hurt you. A nasty officer should come out of the door past the metal fence, and brandishing a DD44 Dostovei. He is a good shot, so be sure to kill him quickly. Another guard should follow, so get him too.

Now, on 00 Agent mode, you need to install the covert modem. Go through the gate and swing around behind the boxes. There should be a screen there. Switch to the modem, aim at the screen, and it will install itself. Swing around and go forward to the next gate. Shoot the lock, and open it. There are 3 watchtowers in a row, with 1 person on top of each one, so change to your Sniper's Rifle, zoom in close, and peg the first one in the head. You can shoot past him, and he will jump down and run towards you, in a way which makes him easier to hit. Walk forward, and pick off the next two guards. On Agent mode, simply go to the stairs leading off the dam, and walk off. On Secret Agent, you need to finish off the alarms. There is 1 alarm in each tower, so blow them up with the PP7, and then jump off the dam.

On 00 Agent mode, you need to make a data backup as well. The best thing to do is go to the far watchtower, go through the door and down the stairs. This part can be tricky, so be very careful. Use the Sniper's Rifle, and QUIETLY move down the corridor. Soon, you should meet a guard, so kill him. Now, people hide all over the place, so the best thing to do is using the leaning technique (holding R and pressing C Left or C Right) around corners so that you get a couple of shots out and duck back, to avoid any of their shots. A good thing to do is use a loud gun (the KF7) to shoot past them, and nail them when they come around the corner to meet you. Watch out, because their aim is much better than the other modes, and you take a lot more damage. Oh, and sometimes when you go down the corridor, people are hiding around the corner, and they might take you by surprise.

When you finally reach the end, there should be a door. Switch to the KF7, and open the door. Prepare for massive attack, no leaning this time. Make sure you kill everyone before entering. Now, move over to the two mainframes, and press B (activate) on one of them. The data backup should take 8 seconds, and you just go back the way you came, and jump of the dam. Mission complete.