Ever since <Titanic> came out, I've wondered about something. The officers were issued revolvers which they used to keep people out of the lifeboats. This made me wonder, who's responsible for the physical security of a ship under way in international waters? Are ship's officers armed? Who is impowered to enforce the law-- to the point of deadly force-- on board a ship in international waters? It is martial or civil law? Is it the law of the country of registry?