40-foot wide sinkhole creates `` millions '' in damages at National Corvette Museum . ` ` There 's a cave down there , '' says museum spokeswoman . Engineers say Sky Dome suffered no structural damage . The sinkhole, which is about 40 feet wide, was caused by the collapse of an underground pipe that carries water to the cavern from below ground.
40-foot wide sinkhole creates `` millions '' in damages at National Corvette Museum . `` There 's a cave down there , '' says museum spokeswoman . Engineers say Sky Dome suffered no structural damage . The cost of the damaged cars is `` substantial , '' a museum director says .