Description: Chinese manned deep-sea submersible gets rare look at deepest ocean depths, the Mariana Trench, 10 Deepest Diving Operational Submarines in the World | Submarines With Maximum Test Depth, Inside a manned submersible
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A submarine is a watercraft capable of independent operation underwater. It differs from a submersible , which has more limited underwater capability. The term most commonly refers to a large, crewed, autonomous vessel. It is also sometimes used historically or colloquially to refer to remotely operated vehicles and robots , as well as medium-sized or smaller vessels, such as the midget submarine and the wet sub . Used as an adjective in phrases such as submarine cable , "submarine" means "under the sea". T
Although experimental submarines had been built before, submarine design took off during the 19th century, and they were adopted by several navies. Submarines were first widely used during World War I (1914–1918), and now figure in many navies large and small. Military usage includes attacking enemy surface ships (merchant and military), submarines, aircraft carrier protection, blockade running, ballistic missile submarines as part of a nuclear strike force, reconnaissance , conventional land attack (for ex
In baseball , a submarine pitch is one in which the ball is released underhand, and often just above the ground, with the torso bent at a right angle and shoulders tilted so severely that they rotate around a nearly horizontal axis. (This is in stark contrast to an underhand pitch in softball in which the torso remains upright, the shoulders are level, and the hips do not rotate.)