There's a guard with a baton patrolling the hallway at the top of the green ramp. If he spots Lara, he'll come after her. He's unable to climb down the grate, though, so you'll have to lead him elsewhere. As he moves off to the left, run up the ramp and turn right. Pause if necessary to make sure the guard sees you. He'll yell "hey!" when he does.
Then, with the guard chasing you, run through the next room and past the MJ-12 box. Don't turn right here or Lara will set off a motion sensor, activating a gun turret, which will prevent you from getting very far. Instead, just beyond the MJ-12 box, turn left.
Run forward between the wall on the left and the angled block on the right. Then turn right.
Run off the edge into a rectangular opening in the floor.
Continue forward, down a series of metal blocks...
...and into the corridor directly ahead. Press the button on the left to let another prisoner out of his cell.
Move out of the way and let him subdue the guard. Then you can loot the body for a KEYCARD TYPE B. The grated opening at the end of the hallway overlooks an area you'll visit later. The other metal door doesn't open yet, so leave it for now.
Climb back up the metal blocks.
Go back into the room near the MJ-12 box.
Use the KEYCARD in the card reader to open the control room. Enter and pick up the large medi pack and Uzi clips by the window. Push the button to deactivate the motion sensors and gun turret.
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