On 8th November @19:20hrs. The maintenance barge Fahal 2 was moored alongside Single Mooring Buoy (SBM) 1, continuing work to install a subsea loading hose string. To prevent the SBM turret from rotating the provided locking pin had been fitted at the start of the day. A sea swell was causing the barge to surge with the SBM. The locking pin sheared inside the guide tube and was being extracted by three members of the team, when the SBM turret began to rotate, a call to ‘keep clear’ was shouted, however the Diver did not remove his hand from the line of fire in time and the SBM turntable locking pin fell on the diver's hand causing a fracture to the right-hand index finger. Why it happened/Finding : Sea swell and current acting on SBM & barge caused the locking pin to fail The broken locking pin was too heavy to move by hand The task had not been risk assessed The supervisors were not informed of the failure or present during the task