[8.3]. Mission 3 - G5 Building: Reconnaissance (3)

Disable Damping Field Generator: Start by facing invisible guards; one carries a key card. Wait for them to attack to see their outlines, then eliminate them. Proceed through the unlocked door. Kill the guard at the end of the hall and activate the control panel beside the door. Enter the next room, turn right, and pass through the glass-windowed door. More invisible guards will appear; defeat them and retrieve another key card. Enter the door within the glass case. Shoot the guard immediately upon entering, grab the shield near the stairs, and ascend them. Go right at the top and down a short hallway. Eliminate the two guards and find the Alarm panel. Go through the door next to it (you may need to complete objective 2 first if it's locked). Kill the guard at the bottom of the stairs and descend. Head right down the hallway. Kill the two guards at the end and activate the control panel on the far wall by pressing B. Return to the Alarm room.

Deactivate Laser Grid Systems: Ensure the third guard doesn't reach the control panels. Eliminate him when he enters. Deactivate the four control panels in the area to turn the lasers green.

Photograph Meeting Conspirators: Go through the door next to the Alarm, kill the guard at the bottom of the stairs, and proceed right down the corridor. In the next room, defeat three guards. Use the Camspy, follow the pipes into the next room, ensuring it remains undetected by guards to avoid mission failure. This action will complete the objective.

Retrieve Dr. Caroll Backup from Safe: Drop down and eliminate any nearby guards. If an alarm is triggered, disable it. Go through the door left of the Alarm, clear guards near the stairs, and ascend. Turn right at the top, deal with any guards, and enter the door in the green area on the right. Use the Door Decoder on the control panel next to the door. Wait for 1 minute for the vault to open. Enter the large blue vault and retrieve the Backup Disc.

Exit G5 Building: Exit the vault room, head straight towards an explosion, and pass through the hole in the wall to complete the mission. If no explosion occurs, return to the level where you placed a mine in Chicago stealth, find the concrete door, and detonate it yourself.