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Off shore oil vessels – Platform supply vessel, pipe layers, accommodation and crane barges, non and semi-submersible drilling rigs, drill ships, production platforms, floating production storage and offloading units. It has all the amenities, including offices, gym, crew cabins, hospital, salon, recreation room, common rooms, laundry, and galley. As of 2004, the United Nations Food and Agriculture Organization estimated 4million fishing vessels were operating worldwide.

A duct keel is a hollow structure that consists of two longitudinal girder and solid plates and is welded to form a box-type structure, which is generally provided in double-hull ships. Others include Great Lakes freighters, riverboats, and ferryboats, which may be designed for operation on inland or protected coastal waters.That year, the top ten marine capture species also included Alaska pollock, Blue whiting, Skipjack tuna, Atlantic herring, Chub mackerel, Japanese anchovy, Chilean jack mackerel, Largehead hairtail, and Yellowfin tuna. Their designs were unique, evolving from ancient rafts to the characteristic double-hulled, single-outrigger, and double-outrigger designs of Austronesian ships.

My answer doesn't account for the naming of most vessels of the Royal Navy "HMS", although this is a relatively modern convention; the RN used to refer to "His/Her Majesty's Sloop So-and-so" and "His/Her Majesty's Frigate Such-and-such". Ship construction takes place in a shipyard, and can last from a few months for a unit produced in series, to several years to reconstruct a wooden boat like the frigate Hermione, to more than 10years for an aircraft carrier. Since the freshwater lakes are less corrosive to ships than the salt water of the oceans, lakers tend to last much longer than ocean freighters.

Spills resulting from accidents like collisions, groundings, hull failures, and explosions are much larger, with 84% of these involving losses of over 700tons. In most of the developing world, however, shipyards can operate without the risk of personal injury lawsuits or workers' health claims, meaning many of these shipyards may operate with high health risks.