Thanks for the response. I guess my main concern is trying to figure out if the tunneling empty space under there is from rats or termites. Rats in the area has been an issue in the past, and if its termites im worried they are going to reach my house which is 20 feet away from that pit, and about 10 feet between that pit and my house is a large dip in the stone where I am guessing is another hollow spot.
If we remove the stone could we use some natural remedies to make the area termite proof? I think you're right that digging out what remains might be the only option.
Silly question (If lets say termites eat all the roots and dont make it to the house would they just die-off because theres nothing left for them to eat?)
