Today I drove a ghost into the middle of the six pillars and the Engineers were making a lot of noise. Then I pushed a large stone object (I'm calling it a mini-pillar) from the nearby room into the middle.
This made them go mental, schreeching and chirping and making noises I've never heard before.
Somebody should listen to these different noises played in reverse, they could be a secret words like the H3 terminal voices.
And I was thinking, since there are 'Tri-Gates' in H2 and H3, shouldn't ODST have at least one? Could Stonehenge be a Tri-Gate?
I'm going to keep my eye out for some more mini-pillars, maybe if I find six to stand beside the other pillars something else will happen.
If anyone wants to know, the Ghost in Mombasa Streets is in a rectangle-shaped area near the NMPD beacon. But it only appeared when I led a hunter into the area, so you can do that if you're looking for it.
~Reekhon