When you pressed the button in the office with the blue lock, the conveyor belt dumped an MJ-12 box on the floor here. Climb on top of it and jump to grab the ladder on the wall. Climb onto the ledge above.

Stand beneath the duct made of black metal grating and jump straight up to grab it. Continue holding Action and use the direction buttons to monkey swing across the room to the ledge with the small medi pack. Release Action to drop onto the ledge and pick up the health.

Turn around, and jump up to grab the grating again. Now monkey swing forward to the middle of the room, turn left...

...and follow the duct past the moving hook. It's safe as long as you don't get too close. At the end of the duct, drop down onto the stairs near the wall.

Step up onto first stair, turn around, and jump straight up to grab the edge of the opening above.

Pull up and kill the guard lurking here. He's carrying the THIRD YELLOW SECURITY PASS. Somehow I don't think he'll mind if you borrow it.

Move into the middle of the room, where the ceiling is a little higher, and take a standing jump over the laser beam to reach the save/power-up crystal.

Jump back over the laser and drop down through the hole onto the stairs.

Move down to the lowest step, and then safety drop to the floor, losing a smidgen of health in the fall.

- OR -

Alternatively, if you're really trying to conserve health, you can monkey swing back to the ledge above the MJ-12 box and then drop down.

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