Police in Norway said on Saturday they would use a mini-submarine to help in the search for more bodies of victims from the shooting massacre on an island near Oslo that claimed at least 85 lives.
Norway's Red Cross said its scuba divers would also help in the search around the island.
"Tonight a mini-submarine will be sent and go through the whole night" looking for bodies around Utoeya island, police spokesman Dag Gjaerum told the media.
On Friday a gunman posing as a policeman opened fire on the island where hundreds of mostly young people had gathered for a camp run by the ruling Labour party, police and witnesses said.
Police say there are at least four or five people still missing.
Survivors of the shooting rampage, some of them wounded, were being cared for Saturday at the Sundvolden Hotel on the mainland near the island.
"Some of the youths here are wounded, problems with legs or cuts," Gjaerum said.
"Relatives, parents, brothers and sisters are here, talking about yesterday's incident," he said, adding that they were getting help from pastors and psychologists.
Jahn Petter Berentsen, head of Norway's Red Cross, said that as well as counselling their scuba divers were helping in the search for bodies around the island.
"There are Red Cross scuba divers with underwater cameras going round the island," he said.
"It's a tragic situation and a difficult day for everybody that's been involved," he added.
"Earlier there were many survivors and people were happy to have survived.
"Now most people are those who've lost some of their closest, so it's difficult, there's lots of emotion and we are just here to be a hand to hold."
Police have been searching the sea around the island after some people jumped into the waters to try to escape the bloodbath.
The gunman shot at many of them as they tried to swim to safety.
Police are "working on giving the island the all-clear", the spokesman said.
They arrested a 32-year-old Norwegian - identified by media as Anders Behring Breivik - and say the suspect has admitted to the island shooting spree.
He is also suspected of a bombing a few hours before the island attack in the government quarter of the capital Oslo that killed at least seven people.