All I want to say is: HAHAHAAHAHAH @ EA!!!!
The doors were initially only able to be unlocked when one has a completed save game from Dead space ignition. it is like a storage room, except that there were bonus text/audio logs in them and even a new suit in one of the rooms.
We, PC gamers were of course royally screwed since EA decided that there will be no expansion for the PC version whatsoever.
Seriously EA you guys are a bunch of fags. At least don’t be such lazy asses and just port EVERYTHING over. It really shows how much you really give a damn about to your customers (PC ones, in this case)!