Vents 

The Agents turned their augmented ears to the noise, and two of them slunked off along the vent again, bending and twisting his body in odd fashions. They came to a vertical transition in the vent shaft, and dropped down it, landing and looking around before scurrying through it and coming to a corner, peering around it.

Ahead of the empress one could see two human heads sticking around the corner in a curious fashion, before one whispered something to the other, then withdrew and slinked off down the vent again, activating his Hardlight Pistol. The other continued watching, and let out a hiss before speaking "Apply!" He said harshly "Where are you going?". An odd gurgling could then be heard from his direction, echoing down the vent shafts and through the tunnels.