GamesRadar - During Chapter 14 of Dead Space 3, you will get the optional side mission of going to the Reapers Barracks. Choose to do the quest and when you immediately enter the barracks, you will come to a gate. Make your way through and then go to the left to enter a room on the second floor.
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via N4G: pc news feed http://n4g.com/news/1168653/dead-space-3-peng-location-guide