Go west through three doors. You will find a room with several locked doors and fires.
Extinguish the fires and use the computer console at the north west of the room.
Go east twice and use the computer console. Use the code 6752 to open the locked door back in the previous room.
Go through the now unlocked door, then go west, extinguishing the fires that block your way.
You will now be in a room with more locked doors. Follow the room around to the north and blow the up barrels on the south wall that are in the way of a computer console. Use this console.
Use the console next to the door on the west wall of the room and enter the code 1122. Enter through the door.
Talk to the civilian and try to use the computer, using the login code of 4453. Talk to the civilian again.
Go back to the start of the level and talk to the scientist until he wakes up.
Use the computer console to learn about the SQL SELECT statement.
Go back to the database computer and retrieve the codes from the database. These are:
Door 13: 1313
Door 27: 3416
Door 17: 1122
Door 44: 8862
Door 61: 1554
Door 99: 1209
Exit back into the other room and follow the room round to the north. Unlock door 44 at the northeast corner of the room using the code 8862.
Find your way through the maze to the exit in the north east. You should reach a room with four pillars and barrels.
Go east and then south. You will find Dr. Jensen locked in a cage (Cell 42-A).
There are two computer consoles at the south end of the room. Use the one on the south wall.
Use the console on the east wall and enter the code 229 to unlock the cage.
Go to the cage and talk to Jensen. Go to the west corner of the room and break the crate blocking the computer console. Use the console and enter the code 648 to open the secure closet.
Get the blue keycard and rocket launcher, then go to the south end of the room with the computer consoles. Talk to Jensen.
Go through the door to the west of the prison cell and exit the level through the blue door.
Secrets
5 Total: 11,26 - 3,15 - 20, 3 - 23,7 - 28,4
Door Passwords: #9:6752, #13:1313, #17:1122, #27:3416, #44:8862, #61:1554, #99:1209
If you talk several times to the other prisoner in the Cell 42-A before you get the blue key, he will give you 20 UAC credits.
I got the UAC credits even after getting the blue key.