The oil spill originating from the Chennai Petroleum Corporation Ltd (CPCL) refinery has expanded its reach to at least 20 square kilometers into the sea, as reported by the coast guard. The aftermath of the spill, which has been ongoing for a week, continues to exacerbate damage to Chennai's ecologically sensitive Ennore creek. The impact is visible along the river Kosasthalaiyar, where tar balls and substantial oil layers now mar the coastline, leaving a trail of deposits on shores and fishing boats, as reported by NDTV.