What do the armored mainframes look like?

To destroy the armored mainframes in the 'Control'
Level, you must first battle your way into the
Control room while Natalya keeps trying to hack the first blast door open.(you go through the second blast door which opens at the far end of the room)
Don't stay in one place very long around this area
Or you will get blown up by a hand grenade.Fight
Your way into the control room and clear it out,
Top and bottom level.(follow 'Boris' to some body
Armor, don't kill him) Now, with your back at the main video screen, go to the door on the right side
Wall(lower level)get ready to move out of the way as
You open this door because it has at least one
Robotic gun hanging from the ceiling inside.(you can choose not to attack this room, but when you are
Trying to guard Natalya while she hacks the main-
Frame, a lot more guards will be dispatched to get
Her)Once that room is cleared, if you have enough ammo and/or explosives, start blowing or shooting
Up all the desks in the main room, except the one that's front and center to the main screen.(Natalya
Needs to use this terminal as you guard her) Destroy
All the obstacles that will keep you from shooting the guards quickly on each side of the room. Once
Thats done, go to the door at the top of the spiral stairs on the left(again with your back to the main screen) and let Natalya in. It's VERY important to
Stay near to Natalya(about ten feet behind her)And
Move from one side of her to the other, as the guards start to attack your position. Make sure you
Cover the top and bottom of each spiral staircase,
And keep a close eye on the areas BEHIND the stairs
On the lower level.(approx 9:00 & 3:00) If you make
It and Natalya makes it through this firefight, you
Just might have some skill. Now, she takes off the way she came in, and 007 (you) go to the door that
Is on the right end of the back wall(the main video screen being the front wall) on the main floor, and
It should open for you now. The armored mainframes
Are in this room,along with one or two guards.(hope
You saved at least two remote mines, and I hope you know how to toss them accurately, and detonate them
Quickly) Don't leave the room and let the door shut
Because they won't work. Stand in the doorway, facing the mainframes and detonate them. Now get the hell out of there! Run to the other end of the
Back wall(to your right as you come out of the
Armored mainframe room) Take another right, and straight ahead to a yellow and black marked
Elevator door.(lookout for a couple of sneaky guards
Around here) Get to the door and hit the 'B' button.