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A moon pool is an equipment deployment and retrieval feature used by marine drilling platforms, drillships, diving support vessels, fishing vessels, marine research and underwater exploration or research vessels, and underwater habitats. [1]
Sidemount diving offers some benefits in the flexibility of equipment. Cylinders suitable for sidemount diving are usually freely available for rental, unlike manifolded twin sets for back-mounted use, which allows the traveller to conduct technical or overhead environment dives without having to source twin cylinder sets.
This allows operations at sea where mooring or anchoring is not feasible due to deep water, congestion on the sea bottom (pipelines, templates) or other problems. Dynamic positioning may either be absolute in that the position is locked to a fixed point over the bottom, or relative to a moving object like another ship or an underwater vehicle.
U-boats could attack from underwater without warning, or attack on the surface, typically with warning. The latter method was how the first merchant ship lost to U-boats was sunk: This, the Glitra , was an 866-ton British steamer outbound from Grangemouth to Stavanger with a cargo of coal, iron plate, and oil.
Larger boats can run this segment of the river with the maximum tow size of 42 barges southbound and 40+ northbound. A typical River tow might be 35 to 42 barges, each about 200 feet (61 m) long by 35 feet (11 m) wide, configured in a rectangular shape 6 to 7 barges long and 5 to 6 barges wide, depending on the number of barges in tow.
Comparison of conventional hull and the Visby-class corvette. Tumblehome has been used in proposals for several modern ship projects. The hull form in combination with choice of materials results in decreased radar reflection, which together with other signature (sound, heat etc.) damping measures makes stealth ships.
Skipjack under sail. The skipjack is a traditional fishing boat used on the Chesapeake Bay for oyster dredging.It is a sailboat which succeeded the bugeye as the chief oystering boat on the bay, and it remains in service due to laws restricting the use of powerboats in the Maryland state oyster fishery.
A glass-bottom boat is a boat with sections of glass, panoramic bottom glass or other suitable transparent material, below the waterline allowing passengers to observe the underwater environment from within the boat.