The development trend is: the development of hull "stealth", "noise reduction" technology, improve concealment; development of high-strength pressure-resistant materials, increase the depth of submarine diving; the development of nuclear-powered submarines, high-power nuclear reactor. nuclear reactor, increase underwater speed, extend the core life, improve the time on board;
Conventional-powered submarines mainly increase battery capacity, the development of good performance of hydrogen-oxygen fuel cells, sodium-sulfur batteries and superconducting motors, in order to improve underwater maneuverability; equipped with high-efficiency integrated sonar, towed sonar and hydroacoustic countermeasures equipment, increase the underwater detection distance and improve the ability of hydroacoustic countermeasures; to increase the range, hitting accuracy, striking power, and the impact of missiles, the ability of the submarine to detect and destroy the submarine. range, hitting accuracy, striking power, and increase the anti-anti-missile capability such as diversion multiple warheads.
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Historical Background:
The first submarine ever used for military purposes appeared in the American Revolutionary War. David Bushnell of Yale University in the U.S. built the Turtle, which could be submerged up to 6 meters underwater by filling the water tanks with water through a foot valve, and could stay submerged for about 30 minutes.
The boat is fitted with two hand-cranked crank propellers, which allow the boat to gain about 3 knots of speed and maneuver the boat up and down. The boat has a hand operated pressure water pump that drains the bilge to float the boat.
The boat carries an explosive packet that can be detonated with a timed fuse, which can be maneuvered inside the boat and placed on the bottom of the enemy ship. In 1776, the Turtle attempted to attack the Royal Navy Eagle (HMS Eagle), although unsuccessful, but created the first submarine attack on a warship.