The Gulag - Call of Duty: Modern Warfare 2
This mission starts off in a helicopter. You're required to take down any troops on those towers of the monastery you see, the ones with RPG's taking high priority. After the landing, simply follow the MacTavish and take out all enemies in the distance with your sniper rifle. Having done so, follow MacTavish & Co. southwest.
ENEMY INTEL #25:
Before entering through the gate with red lights, go up the short stairs nearby in the southwest corner. This intel is found in this room.
Video showing the location of Enemy Intel #25.
Head through the tunnel and dispatch the enemies as you go. A flashbang may help to sweep the tunnels clean. Ghost will stay in the control room - you have to follow MacTavish.
ENEMY INTEL #26:
This intel can be found in the monitor room in which Ghost stays behind. Check the northern side of this room to locate it.
Video showing the location of Enemy Intel #26.
Head down the stairs and clear the cells. Wait for Ghost to unlock the doors and circle around the area until you can go downstairs to a platform in the middle of the area. There are many weapons here, but it's best to grab one of the Riot Shield to take better cover from the many enemies.
After Ghost finally unlocks the door, follow MacTavish and use your riot shield to bash any enemies in your way, but don't get careless either.
ENEMY INTEL #27:
After passing the first cell doors in the circular chamber, with blue lights indicating they're unlocked, check the prison to your right/northeast, which is marked as prison 327. This intel is found inside.
Video showing the location of Enemy Intel #27.
Circle around the room and follow MacTavish down the rope, head down the dark tunnel and put on your nightvision goggles. Clear the tunnel from enemies and make your way through the cell blocks. Go through the next tunnel and take off your nightvision goggles. Dispatch the enemies around the corner behind several pipes and clear the area beyond here as well.
Breach the wall instead of the door at the end of the area, and fight your way through the showers. This is a rather intense shootout, and the second wave of enemies mostly has riot shields, so be prepared to use close quarters combat if necessary. Snipe the enemies on the first floor above you and eventually jump down the hole to reach a sewer canal.
Follow the sewers and slide down to close in on your objective, prisoner 627. Breach the wall, quickly kill the single troop (being held by 627) and watch the brief scene.
ENEMY INTEL #28:
After breaching the wall and locating prisoner 627, immediately look to your left/northeast. This intel is located here.
Video showing the location of Enemy Intel #28.
Escape the area by following the Captain. You'll be forced to turn around at one point - simply head into chamber you pass earlier, which has a big hole in roof. The chapter almost end - clip to the rope after the brief scene and you're all set.