Yes, 'JB', working underground trying to dig their way to your collection, so keep your Eyes peeled on the living room floor for any cracks appearing...
Sorry JB that was me
I was in the process of tunneling towards your collection (there's a few htf I'm after) when the lot caved in .....oh well back to the drawing board maybe an air attack, spare airship anyone ????
Those things open up all the time where I live. They tend to follow an underground river or cave system. If you look at them from the air, you can connect the "dots" and make fairly straight lines. One of the larger ones here swallowed up a road, a house, an olympic size swimming pool and the local Porsche garage along with nearly a dozen Porches. I was a diver on the salvage crew for the Porches and several other things. They are so common here that I have "sink hole insurance" coverage on my home. Without the special insurance, normal homeowner's policies won't pay for the damage or loss.