Conventional power submarines mainly increase battery capacity, develop hydrogen-oxygen fuel cells, sodium-sulfur batteries and superconducting motors with good performance, and improve underwater maneuverability; Equipped with efficient integrated sonar, towed sonar and underwater acoustic countermeasure equipment to increase underwater detection distance and improve underwater acoustic countermeasure capability; Improve the missile's range, hit accuracy and strike power, and increase anti-missile capabilities such as multiple warheads.
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Historical background:
The first submarine used for military purposes appeared in the American War of Independence. David bushnell of Yale University built this turtle. By injecting water into the water tank through the pedal valve, the ship can dive 6 meters underwater and stay underwater for about 30 minutes.
The boat is equipped with two hand-operated propellers, which enables the boat to achieve a speed of about 3 knots and control the boat's lifting. There is a manual pressure pump in the boat, which can drain the water from the water tank and make the boat float.
An explosive charge that can be detonated by a timing fuse is carried outside the boat and can be placed at the bottom of the enemy ship inside the boat. Only one person can operate the rudder and propeller inside. 1776, the turtle tried to attack HMS Eagle without success, but this was the first attempt by a submarine to attack a warship.