Flank the turrets and shut them down | Mission 6: For Bella A: CM Guide
Last update: 11 May 2016
Move ahead without stopping at any of the forks to avoid getting in the fire range of the turrets on your right. At the end of the corridor, on the left, you can crawl inside a vent shaft, illustrated above.
Crawl through it to find yourself in a small room. Start climbing where shown on the screen; you need to get to the adjacent room.
Leave the room, turn right and disable the first turret. I suggest going to the other side of the corridor now, which the turret has been monitoring. Use the welding torch on the door to the room on the right (the above screenshot) and search it to get the third and last Audio Log.
Backtrack to the disabled turret and use the welding torch on the closed door there (the above screenshot). Approach the second turret and shut it down.