Workers look into a sinkhole caused by a broken water main in Chicago, Illinois, April 18, 2013. Heavy rains and flooding brought havoc to the Chicago area on Thursday, shutting major expressways, delaying commuter trains for hours, cancelling flights, flooding basements and closing dozens of suburban schools. On the city’s South Side, a sinkhole opened up on a residential street, swallowing three cars, according to Officer Mike Sullivan of the Chicago Police Department. One person was hospitalized with non-life-threatening injuries. REUTERS/Jim Young (UNITED STATES – Tags: ENVIRONMENT TPX IMAGES OF THE DAY) – RTXYR8X