Speaking to the "Morning Post" claimed to have detected all the 60 cm depth. His suspicions were confirmed by images taken by a "geo-radar" of the British police.
The newspaper writes that an international expert, contacted by the investigator, said he had no doubt that there is an object buried in the area concerned.
While in Praia da Luz, Birch oversaw the Murat house 24 hours a day, with the help of two assistants and even four times to enter the yard at night.
In his statements to the newspaper does not make accusations, ensuring that their aim is to discover where the body was buried, because "once removed, will be much easier to solve this case." The South African believes that in time, Murat's house was not "investigated in the most correct."
Madeleine disappeared a few days before to four years, May 3, 2007, the room where he slept with the two twin brothers, the youngest, in an apartment in a resort in Praia da Luz in the Algarve.
The police searched Robert Murat's house and garden in May 2007 and again in August 2007, when a British sniffer dog was brought in.
August 5th 2007
Police in Portugal investigating the disappearance of Madeleine McCann have ended a two-day search of the home of Robert Murat.
Mr Murat, 33, the only official suspect in the case of the missing child, denies any involvement.
Police returned to the house at 0700 (0600 GMT) to search inside the property and its grounds.....
....BBC correspondent Steve Kingstone said police were using scanning equipment over the floorboards inside the premises in Praia da Luz.
As many as 10 officers - including two British detectives - spent 12 hours on Saturday searching Mr Murat's Algarve villa, which is owned by his mother.
Much of the day had been spent clearing thick vegetation, and a sniffer dog with a British handler inspected the premises.
Mr Murat, who was declared a suspect 10 days after Madeleine was last seen, was not arrested or questioned. He was on the premises with his lawyer as the latest search was conducted.
Stephen Birch Interview.