Audio Diary #8 – “Goodbye to Fontaine”

Inside the Office of Frank Fontaine. Turn the boar head to reveal a hidden safe, as well as this audio diary.

Audio Diary #9 – “Abort the Experiment”

After shutting down security and entering the Plasmid Laboratory, this table with an audio diary and Big Daddy helmet will be immediately upon your left. If you enter another underwater section, you’ve gone too far.

Audio Diary #10 – “Solving for X”

Under one of the circuit breakers you use to restore power in Gil Alexander’s giant tank room.

Audio Diary #11 – “Gil’s Place in the Plan”

Next to the Gatherer’s Garden in Gil Alexander’s giant tank room.

Audio Diary #12 – “Outlived Usefulness”

“Pacification Chamber” side of the laboratory. On the control deck of the observation room.

Audio Diary #13 – “Goodbye, Dr. Alexander”

“Holding Cells” side of the laboratory. Below one of the Little Sister vents… on your map, it’s the left vent in this area.

Audio Diary #14 – “Big Sister”

“Holding Cells” side of the laboratory. Next to the Power to the People weapon upgrade station in the locked Surveillance Office.

Audio Diary #15 – “Betrayal”

“Holding Cells” side of the laboratory. Below your feet in the Live Test Facility is a hallway full of prison cells. The northwestern cell (when looking at the map) contains the audio diary, but is also frozen shut. Go through the back of the northeastern cell and Incinerate the ice through the bars.

Audio Diary #16 – “Meltzer’s Choice”

“Holding Cells” side of the laboratory. When you kill the Big Daddy in this area, make sure to search his corpse carefully. There’s an audio diary with a nasty surprise.

Audio Diary #17 – “The People’s Daughter”

Use the genetic key at the Oxy-Fill station to open the entrance to Lamb’s hideout. The audio diary is in the hallway leading to the level-ending elevator.