Residents "blame the state [of #SD] for selling land that became the Hideaway Hills subdivision despite knowing it was perched above an old mine. Since the sinkholes began opening up, they and about 150 of their neighbors sued the state for $45 million to cover the value of their homes and legal costs."

AP https://www.yahoo.com/news/giant-sinkholes-south-dakota-neighborhood-140053271.html