Rescue teams searching for the voice and flight data recorder from the crashed Super Puma helicopter off the Shetland coast have successfully retrieved the black box.
"The combined voice and flight data recorder from the AS332 L2 Super Puma helicopter has been successfully recovered and will be transported to the AAIB HQ in Farnborough later today," UK’s Air Accidents Investigation Branch (AAIB) announced in a statement.
The black boxes are believed to reveal what caused the accident that killed four of 16 passengers aboard the Super Puma on Friday night.
According to available information, the aircraft’s flight was normal until three miles from the airport. It crashed into the sea two miles west of runway 09 when airspeed dropped along with an ''increased rate of descent'', the AAIB said.
''The evidence currently available suggests that the helicopter was intact and upright when it entered the water,'' a statement said.
Earlier today, parts of the wreckage were recovered and transported to the port.
The AAIB said the investigation is at an early stage and the factors that led to the crash cannot yet be identified.
Representatives from the French accident investigation authority (BEA), the helicopter manufacturer and the engine manufacturer were also invited to join the investigation by the AAIB.
Earlier today, Frank Doran - a Labour MP - called on Transport Secretary Patrick McLoughlin to establish a wide-ranging inquiry to properly investigate the crash, the fifth accident involving a Super Puma helicopter since 2009.