After picking up the medipacks for secret #2, as shown in part 1, return to the other end of the scaffolding, where you dropped down, and climb back onto the middle level.

Climb/jump onto the wooden block.

Then either jump past the corner to land on the upper level of the scaffolding, or drop down to the middle level and climb up from there.

Notice the yellow switch on the side of the building to the north, and the dangling rope between the two buildings. That's where you're headed next, but first...

Head for the alcove in the stone wall about halfway along the wall on this side...

...to find a large medipack. Grab it and turn around.

Take a running jump to grab the rope. It's difficult to see it in this screenshot, but it's directly in line with the alcove where you found the medipack.

Swing across the gap to the scaffolding on the opposite side. Then head for the yellow switch.

Stand directly under the switch with Lara's chest against the wall. Jump straight up and hold Action to grab the switch and pull it down...

...opening the gate below.

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