According to the self-style investigator, he used a ground penetrating radar device in order to locate Madeleine McCann. The said equipment uses radar pulses to perform X-ray on the subsurface.
It was in 2007, when Madeleine was only three years old, when she and her parents had a trip to Portugal. While they were having dinner with friends at a restaurant, Kate and Gerry McCann did not know that their daughter had already vanished from their apartment in Praia de Luz.
Sky News collected data saying that Birch had been very obsessed with finding the body of the missing child that he had already spent $30,000 from his own pocket just to buy the equipment he had used in searching for Madeleine’s body. Birch says that all he wants is closure for the family of Madeleine. With regards the gravesite of the girl’s body, McCann said is it just close to the apartment where she had disappeared and that he has analyzed the scans that show a digging and some bones.
He added that he had already furnished a copy of the radar scans to the Scotland Yard detectives, the Portuguese police, as well as other agencies that are looking into the case.
As of press time, there has been no comment yet from the family and parents of Madeleine.
Source : http://www.huffingtonpost.com/2012/07/06/madeleine-mccanns-grave-found_n_1653768.html