Investigators in the Madeleine McCann case cleared a large area of woodland at the Algarve reservoir to collect samples, which have been sent for forensic and DNA testing in Germany.
Christian Brueckner visited the Arade dam of the Barragem do Arade reservoir, possibly with others, shortly after the toddler vanished from her bed in May 2007, a former friend has told police.
There was no immediate information made available by the other force, the Policia Judiciaria, but the move likely signals an end to the operation, which started on Tuesday, in the next few hours
Police are desperate to find the video camera as they believe it may contain images of Madeleine, but also of other sex attacks Brueckner is said to have carried out on at least two unidentified women.