Specifically, one person suffered injury, after falling from the catwalk to the pipedeck during a lifting operation.
He fell a distance of 3.6 metres, and received first aid on the spot before receiving medical treatment ashore.
A team of specialists from the PSA has now started work on its investigation.
The main aims are to identify the causes of the incident and possible lessons for the future. The investigation will end up in a report.
During its investigation, the team will seek to identify direct and underlying causes.
It will also apply necessary enforcement powers to correct possible breaches of the regulations.