This weed farm was underneath this house in a cave. The entrance was through a secret hydraulic door in the garage that led to a concrete ramp that went about 50 yards into the ground. Inside the cave was living quarters and a secret escape hatch that led you through a tunnel that exited via another hydraulic door that opened up a rock on the outside.
It was very elaborate. The set up allowed them to harvest every 60 days which resulted in multi-million dollar sales. One of the guys busted was living in a house on the water in FL and had a nice yacht. One of the agents here in Nashville worked on this for 5 years before the warrant was finally served in December.