"At first it seems strange the drones have picked this barren and resource deficient place to build a new hive. But then again, while you were blowing up the place, you noticed a few vessels that might have been used as transports, indicating the drones were pulling in the materials they needed from someplace else. As to compliment you on your reasoning, your communication systems start indicating several different incoming transmissions in drone beeps and clicks and after a while you manage to coerce your instruments into pointing out an approximate spatial origin of the message."
This escalation is described in Desolate Site