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Blue Prints for the Holograph belt
The first blue print: In the first room, after killing all the men, you can get one blue print at the second level of the room to the left.
The second blue print: The second time you are on the elevator you can blow up the top of the elevator and grapple up using the grapple. This works best when you are near the side of the elevator.
The third blue print: You will come to a room with brown walls (the rest of the walls are blue). the room after this is the second to the last room. After you exit the second to the last room quickly grapple to the top of the elevator and walk through the wall to the right.
The fourth blue print: In the last room There will be one man and one guard. Jump over him. Do not kill him. Go to the other end of the room and grapple upward at the light over head.
The last blue print will fall down. Now kill the guy before.