A1: No need I dont think from memory.you need to bypass the 2 contol panels
that moves a missle from the truck,get on the truck,then onto cab roof.
jump up then move along the pipe,drop down on the hatch ledge,go down the ladders then drop down.
at the bottom of the corridor to the right are 2 guards one is patroling in
and out of the right side doorway the other sitting down.
you need to go left and enter the doorway,to the right is a vent hatch jump up get in then fix the panel it takes lift up,crawl through the other spaces and jump down silently.
you can hear the the korean captain talking,well open the grill panel and drop down into this control room.do your buisness in there and return the way you came.
theres no rush so take your time and stay in the dark and move silently.
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im not sure if this is the position in the game you were but thats how you get in that room undetected..