"Danger in Honeycomb of Old Wells"
"In the last 150 years, prospectors and energy companies have drilled as many as 12 million holes across the U.S. in search of oil and gas. Many were plugged after they dried up. But hundreds of thousands were simply abandoned and forgotten, often leaving no records of their existence. Government reports have warned for decades that abandoned wells can provide pathways for oil, gas or brine-laden water to contaminate groundwater supplies or to travel up to the surface."