Investigators will try to establish what caused a helicopter to plunge into the North Sea, killing four oil workers, after the wreckage was recovered from the water.
Misty conditions last night hampered efforts to salvage the wreckage of the Super Puma and transport it back to shore for examination by a team from the Air Accidents Investigation Branch (AAIB).
It is understood that the remains of the Super Puma AS332 L2 were eventually lifted on to the deck of the vessel Bibby Polaris which was due to travel to a mainland port.
It is hoped information on the helicopter's black box recorder will help establish the cause of the crash.
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