In 1980, aerial footage of the Dead Sea in Israel showed a coastline with not one single sinkhole. Today, that same coastline contains more than 6,000. And while there are sinkholes in other parts of the world, nowhere do they spread as quickly as along the Dead Sea. As the sea’s water levels continue to drop, the phenomenon accelerates. And despite the pressure to do nothing, geologist Eli Raz set out to reverse this trend and save an ecosystem under dire threat.