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Added Thu, 04/10/2018
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Submarine (submarine, submarine) class of ships able to take and long time to act in a submerged position.

Unlike a surface vessel, the submarine has the ability to deliberately change their draft up to the full immersion in water and leaving depth by filling seawater main ballast tanks. Until 1944, all of the submarine most of the time spent on the surface and was essentially sinking boats (ships that can dive under water to attack in the daytime, or to hide from enemy ships).

For the first time a working model of a submarine was created in 1620 for king of England James I by Dutch engineer Cornelius Drebbel. The first attempt of application of the submarine refers to the war of independence of the United States of America (1775-1783).

Can be adopted for NGOs (unidentified floating object), as in the photo and video and by direct observation.

Translated by «Yandex.Translator»

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