oughly 86,000 ships sail around the world; 400 of these are two-to-four thousand passenger mega-cruisers, five of them carry over 6,600, and over 100 containers can reach as many as 24,000 TEU (Twenty-foot Equivalent unit, unity of measurement for 20-foot containers).These ships exceed 350 metres in length and 200,000 GT gross tonnage; their fuel
