Item description:

save for DARK, must've been the wind 60G...

resign/ rehash to your id and play game then choose load save name: M17 Base Cells 05:52. after load go foward and down the stair, through the door then there will be no alarm tripped on screen, after that pause, reload the save again and follow the previous step... repeat 10 times until it pop... this have to doing ten times or less depand on you own playthrought, because the achievement progress is store on the profile.... but easy to do...