Submarine

The reason why submarines can develop to modern times is that they have the following characteristics: they can use water cover to conduct covert activities and carry out surprise attacks on the enemy; It has greater self-sufficiency, endurance and combat radius, can be far away from the base, and can operate independently for a long time in a larger sea area or even deep into the enemy's sea area, with strong assault power; It can launch missiles, torpedoes and lay mines underwater to attack targets at sea and on land.

Submarines have various supporting equipment and high technical requirements. There are few countries in the world that can develop and produce submarines themselves. The submarine has poor self-defense capability and lacks effective air observation means and air defense weapons; Underwater communication is difficult to achieve two-way, timely and long-distance communication; The detection equipment has a short operating range, limited observation range, and is easy to be affected by the environment. It is difficult to master the enemy's situation; Conventional power submarines have a low underwater speed, and their endurance is extremely limited when they are sailing at high speed underwater. They must be in the state of ventilation pipe navigation when charging, which is easy to be exposed.

The self-sustainment of conventional submarines is generally about 45 days, and the highest record of nuclear submarines can reach 90 days.

It is mainly composed of hull, control system, power unit, weapon system, navigation system, detection system, communication equipment, underwater acoustic countermeasure equipment, life-saving equipment and living facilities.