In the worst floods that have hit Kerala in a century, three districts are on red alert-- Idukki, Ernakulam & Pathanam Thitta. At ground zero of deluge, Idukki remains cut off for the fourth day. With rescue and relief workers unable to reach the affected areas, stranded residents have started reporting an acute shortage of provisions. Officials said that hundreds of vehicles, including those of police and rescue workers, are stuck.