Repeat the trip back to the rope. This time, use the rope to swing to the ledge on the South side of the chamber. Shoot the soldier who is waiting for you. Pick up some revolver ammo and a large medi-pack. Drop down into the hole in the floor and slide down the ramp back outside the building.
Nothing seems to be in the pit.
Stop after the pit and run down the road to shoot the wasp and explore. Climb down the ladder and open the black door with the Action key. Shoot the soldier waiting in the room. Now you cannot open the door with the military symbols. Before you take a right down the road that leads into a tunnel, stop and get off.