Sinkholes Pictures - CBS News Sinkholes A sinkhole swallowed three cars on the Southeast Side of Chicago on, April 18, 2013 injuring one person.The injured man was driving when the road buckled and caved in. The other two vehicles were parked when the sinkhole opened. Sinkholes occurs due to erosion beneath the surface, as when sand falls into underlying cavities, causing the surface to collapse. Flooding and heavy rain, excessive water pumping, water main breaks, earthquakes and construction can all contribute to sinkholes. Credit: Mike Krauser/WBBM Newsradio