Police underwater diving unit searching a river for evidence. Here the diver has found a metal bar used in a crime and is about to hand it to a police officer on the bank...© SHOUT. THIS PICTURE MUST ONLY BE USED TO ILLUSTRATE THE EMERGENCY SERVICES IN A POSITIVE MANNER. CONTACT JOHN CALLAN. Exact date unknown.john@shoutpictures.com.www.shoutpictures.com..