COSL Drilling said an investigation launched by the Norwegian Petroleum Safety Authority will aim to answer whether the death of an offshore worker could have been prevented.
The rig was on contract to Statoil in the Troll field west of Bergen when the accident happened.
The wave hit the rig at the mid-point of two decks of the living quarters that spans one side of the rig at a height of about 20 to 25 metres above the water level.
It broke through six cabin windows of the lower deck and 11 on the middle deck, killing the 53-year-old and injuring two other workers.
Speaking to Energy Voice, COSL vice president of Marketing and Contract, Magnar Fagerbakke, said the rig was now docked in Bergen.
He said investigations teams had gone on board the rig on Friday to begin assessing the damage caused by the incident.
Fagerbakke said: “The investigation report will answer the question of this could happen. The rig was built and classed and certified to work in the Norwegian Sector and as part of the classification process it’s been built to withstand harsh weather conditions.
“The investigation will aim to answer the question on whether there is a need to modify this and if there is anything else that could have prevented this incident from happening.”
Both COSL and Aker Solutions have launched investigations as well as the Norwegian Petroleum Safety Authority.
At the time of the incident there were 106 staff members on board, which was then reduced to 59.
Workers remain on the rig, with the area damaged by the storm made off limits to staff.
The company, which owns and operated three drilling units and two accommodation units in the North Sea area, said there was no indication yet of when the investigation findings would be made public.
Read the extended story on Energy Voice.