The bewildering video shows officials surveying a yawning sinkhole that opened up a residential street on Chicago's South Side after a cast iron water main dating back to 1915 broke during a massive rainstorm.
As you watch, the road collapses literally from under a parked car and it topples in!
Sinkholes are becoming a frequently recurring phenomenon.
Sinkholes are often caused by the underground erosion of salt beds or soluble sedimentary rocks, such as limestone or dolomite. Groundwater flows through these rocks, creating subterranean caverns that can suddenly collapse.