Police officers searching scrubland in Portugal in the hunt for Madeleine McCann have sent cameras into drain systems under the wasteland.
The Metropolitan Police's Detective Chief Inspector Andy Redwood, who is in charge of the hunt for Madeleine McCann, watches police continue to clear and search scrubland in Praia da Luz, Portugal, today.
The search for missing Madeleine McCann continues on wasteland in Praia da Luz, Portugal, as police have applied for an extra seven days to investigate the site.
The two springer spaniels from South Wales Police that are being used at the site were seen sniffing around a flat area of the scrubland that had been marked out with tape this morning.
It is not clear whether they will work over the weekend and officers are not expected to carry out any searches on Tuesday, as it is a public holiday in Portugal.
British police will spend a fourth day carrying out investigations on an area of scrubland close to where Madeleine McCann went missing in Portugal seven years ago.
Officers, accompanied by their Portuguese counterparts, were expected to probe the area in Praia da Luz on the Algarve until Friday but have applied to spend an extra seven days there.
ITV News Central correspondent Gareth Owen said British police had been granted another seven days to work on the search area in Praia da Luz.
A patch previously examined in the search near Praia da Luz has been scanned again with ground-penetrating radar equipment to probe for disturbed earth.
It was moved along the ground by a woman dressed in black, accompanied by a man who had scanned the area earlier.
The device uses radar pulses to take images of the subsurface of the ground to check for any anomalies.
It can be used to check for disturbances in a variety of substances, including rock, soil, ice and fresh water. It can also detect voids and cracks in buildings and under pavements.
Local forestry workers have been clearing large areas of undergrowth within a scrubland search near the resort where Madeleine McCann went missing in 2007.
Forensic police officers were pictured preparing to examine a hole in an area of wasteland to search for Madeleine McCann in Praia da Luz, Portugal, where she went missing in 2007.
There have been a couple of developments here that have taken us and have perhaps taken the police teams by surprise.
At the very edge of the wasteland where officers are searching are a couple of white tents.
Under them is a hole. They found it yesterday, it was covered by a couple of sheets of corrugated iron and then that was covered by some soil.
They dug away and they pulled these sheets apart yesterday and they found this very precise hole in the shape of a square - now, that's of interest to them, they didn't know it was there.
We've seen a couple of police officers in forensic suits inside those tents, we don't know what they've found, we don't know if it is of specific interest but we do know it's something they didn't anticipate when they got here
Police investigating Madeleine McCann's disappearance are using radar equipment to search an area of scrubland near Praia da Luz.
They are looking for areas where the earth may have been disturbed near the area where Madeleine was last seen.
Metropolitan Police officers also continued with a fingertip search of the area as the operation entered its thior
British police investigating the disappearance of Madeleine McCann have arrived for the third day of searches at a site in southern Portugal.
The Metropolitan Police officers were accompanied by Portuguese officers to an area of scrubland in Praia da Luz, close to where the toddler disappeared in May 2007.
They were joined by local forestry workers using strimmers to clear some of the undergrowth covering the site.