They only lost eight cars so far: unfortunately one of the eight was the 1963 Corvette Spyder show car. Another was a 1962 black painted Corvette that was on loan from a private owner that also went into the hole. Two others where production models where the only thing to distinguish them was the sequence number (one was the 500,000 'vette ever built, and the first car of a C something production run where I didn't hear the year mentioned).
I am shocked to hear that they have limestone caves in eastern Kentucky (when I was at Mammoth Cave National Park they said it was the biggest series of caves in the world running as far as sixty miles in every direction from the park: which the ranger modified to say except down, when I asked about encountering magma boiling up through the mantle). Most people know that wherever you have under ground caves you are prone to sink holes; especially if you have ground water moving through the caves.
This is so true in Florida that they exclude sinkhole damage on your home insurance from Gainesville south. Sink holes are so common here that they don't even make the back page of the news paper unless the sinkhole kills you; such as when a guy was sucked in while sleeping in his bedroom (that same week there were three others in a line running through Seffner paralleling, but two blocks north of US 92).
A week ago a nice old lady in her early seventies awoke in Brooksville and was trying to back her Toyota out of the garage when she noticed that her drive way was lying in the bottom of a forty foot deep hole that had opened up in her front yard (swallowing her whole front yard and a little bit of her neighbors on each side.) Within a week she could form a club as four more opened up in her neighborhood.
Generally once every five years or so a major intersection in Springhill on the south side of Brooksville not far from Weeki Wachee Springs "home of the Mermaids" (daughters of Greek sponge fishermen who can hold their breath for three to four minutes) collapses into a hundred foot diameter sink hole and has to be filled in, over and over again, as it is in the center of town and the Fill and asphalt is consider the price of living there.
If you are drilling a ground water well and your hammer sends the well casing pipe flying into the ground on the down stroke. Quickly move the drilling truck away from the area, and then engage a hydrology engineer that specializes in soil stabilization to check out your building site with ground penetrating Radar to see just how big the cave beneath your homestead is. If it is too big to economically fill with concrete pay the engineer off with cash and sell our building site (you pay the engineer with cash because it is illegal to sell land in Florida If you know it is prone to sink hole damage, but then the guy you bough it from didn't say anything about a sink hole forming to you did he?).