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This is the maximum depth at which a submarine is permitted to operate under normal peacetime circumstances, and is tested during sea trials.The test depth is set at two-thirds (0.66) of the design depth for United States Navy submarines, while the Royal Navy sets test depth at 4/7 (0.57) the design depth, and the German Navy sets it at exactly one-half (0.50) of design depth.
Keel depth (sometimes given as Depth to keel) is the depth (or draft) of water from the water surface to the keel of a vessel, the deepest part. The keel establishes a commonly defined reference point to measure to. Keel depth is useful for determining safe operating depth in shallow water.
For many centuries, a hydrographic survey required the use of lead lines – ropes or lines with depth markings attached to lead weights to make one end sink to the bottom when lowered over the side of a ship or boat – and sounding poles, which were poles with depth markings which could be thrust over the side until they touched bottom.
Since the government began production, the book has been known by its year of publishing, instead of by the edition number. After the first major revision, a total overhaul of the book's content completed in 1880 under the direction of Commander Philip H. Cooper, USN, the name was changed to American Practical Navigator.
The Submarine Safety Program (SUBSAFE) is a quality assurance program of the United States Navy designed to maintain the safety of its submarine fleet, specifically, to provide maximum reasonable assurance that submarine hulls will stay watertight, and that they can recover from unanticipated flooding.
Prototype "fleet submarines"—submarines fast enough (21 knots (11 m/s)) to travel with battleships. Twice the size of any concurrent or past U.S. submarine. A poor tandem engine design caused the boats to be decommissioned by 1923 and scrapped in 1930.
Underwater dump sites off the Los Angeles coast contain World War II-era munitions including anti-submarine weapons and smoke devices, marine researchers announced Friday. A survey of the known ...
An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 meters (9,800 ft) and 6,000 meters (20,000 ft).Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains are among the flattest, smoothest and least explored regions on Earth. [1]