There’s not much to do in this mission. Follow the objective markers and acquire intel. Walk down the hall to view some flashbacks and number sequences. When you find three halls in front and to the sides of you, look left. The hall should look like the picture below. On top of the cigarette vending machine is intel.
Walk towards the objective marker, a cut scene will play. After the scene you will have control again. Look right to find a dead end with a red light. The next intel is in the corner to the left.
Keep following the objective marker until you reach the next room. There will be 8 tvs with static and a few desks. The intel is on top of the desks.
Enter the next room for the final scene to end the mission.