Police investigating the disappearance of Madeleine McCann will begin a search of a reservoir in Portugal today.
(Image source: irishmirror.ie)Divers will look at an area around 30 miles away from where the toddler went missing in the Algarve in 2007.
Suspect 'Christian B' is known to have camped in the area.
Officers have already done a search of the dam, but found nothing.
Simon Harding, a former investigative officer at the Met Police, explains why detectives might be going over old ground.
'Perhaps they want it to be done so they are one hundred per cent satisfied that this area known to be frequented by Christian B has been done satisfactorily and where they can hopefully say she's not in that particular area.'
