The United Nations offers freely available materials via their website and the document’s page is a good place to start with links to common themes.
Maritime 2050: navigating the future via GOV.UK see their vision and ambitions for the future of the British maritime sector.
MAIB safety digests Department for Transport Marine Accident Investigation Branch (MAIB) detailing lessons from marine accident reports.
MAIB Annual Reports Department for Transport Marine Accident Investigation Branch (MAIB)