Grim search: an unidentified vessel sails close to the upturned hull of the Bourbon Dolphin
Bourbon Dolphin families fly to Shetland
The families of eight crewmen killed or still missing after Bourbon Offshore's anchor handling tug supply vessel Bourbon Dolphin capsized last night are due to arrive on Shetland shortly, according to reports.
A 15-year-old boy on work experience with the Bourbon Dolphin and his father are among five still unaccounted for.
Ten crew members were found after yesterday's incident. Seven are in hospital, but three others died.
The mother of one survivor has described how he jumped from the boat.
Staff from vessel owners Bourbon Norway were also travelling on the chartered flight from Norway.
The air and sea rescue operation, which started after the incident at about 1750 BST, resumed at first light this morning.
The running of the rescue operation has now been shifted, with response teams focusing instead on "salvage and recovery", the BBC reported.
The coastguard has said it would be a "miracle" if the five missing crew members were found alive.
Richard Crowther, regional operations manager for the Maritime & Coastguard Agency, said a decision had still to be made on whether it was safe for a Royal Navy diving team to enter the ship to search for the missing men.
The divers, from the Faslane naval base on the Clyde, have sent down a remotely operated vehicle to take underwater pictures of the upturned vessel.
Crowther said: "The main risk for anyone going into a vessel like this is the uncertainty of how stable it is.
"There is no guarantee the five people who are missing are actually in the vessel. To put divers into an upturned vessel that could sink at any moment is very risky and dangerous."
Winds were heavier than they had been last night, but conditions were still said to be "favourable" for the operation.
Meanwhile, the mother of one of the survivors told Norwegian radio station NRK that her son had been forced to jump off the ship as it began to flip over.
Turge Drage said her son, Egil Hafsas, had called her from Lerwick to tell how he and two other crew members managed to pull on life jackets and leap into the cold sea before being picked up by another ship and airlifted to Shetland.
A spokeswoman for the coastguard said: "We are not really expecting to find survivors now. It would be a miracle if they had survived all night in five degrees, freezing water. It's very sad."
The coastguard confirmed that the ship was still attached to Transocean Rather rig by an anchor chain.
Grampian Police said they would begin an investigation into the incident once the search operation was completed. A marine accident inquiry will also be carried out.
The ship, which is less than one year old, had been working in the vicinity of the Rosebank oilfield with a crew of 15.
Trond Myklebust, manager director of Bourbon Norway, said he could not speculate on what had caused the accident but confirmed the vessel was carrying out an anchor handling operation with the rig and was connected to it.