Kate and Gerry McCann have said they are "very pleased" that significant activity has taken place in Praia da Luz over the last 10 days.
The McCanns said the fact that no trace of their daughter Madeleine has been found reinforces their belief that she could still be alive.
Police have shifted their investigation from the centre of the town where Madeleine McCann went missing to an area of scrubland a mile away.
Madeleine McCann search police are focusing on an area where ground-penetrating radar equipment has picked up an image beneath the soil.
Seven years on from Madeleine McCann's disappearance, British detectives are in Portugal to meet with police.