Wow...I'm impressed simply in the fact that someone was able to build something like that. I wonder how they found out about it...it seems so well hidden.
I doubt they were running that operation off the metered side of the service, most simply bypass the meter and none's the wiser. It was the volume of cheetos that kept being delivered that was the tip off.
They do a lot of aeriel survellance around here using heat measurements to detect frow ops. Those two transport caves were discovered in a similar manner, but I think they were doing density scans for those.