How to draw a submarine with simple strokes
A submarine, or submarine, is a ship that can operate underwater. There are many types of submarines with different shapes, ranging from small civilian diving detectors that are fully automatic or operated by one or two people and operate for several hours, to Russian Typhoon-class nuclear submarines that can carry hundreds of people and can stay submerged for 3-6 months. . According to volume, it can be divided into large (mainly military), medium or small (pocket submarines, submersibles) and underwater automatic mechanical devices. Large submarines are mostly cylindrical, and a vertical structure (bridge) is usually set up in the middle of the ship. In the early days, it was called a "control tower", which contained communications, sensors, periscopes, and control equipment. Todays deep-sea submarines or professional submarines often no longer have this design. Since World War I, submarines have been widely used and have occupied important positions in the navies of many major powers. Their functions include attacking enemy warships or submarines, near-shore protection, breaking through blockades, reconnaissance and cover-up of special forces operations, etc. Submarines are also used for non-military purposes, such as marine scientific research, property rescue, exploration and mining, scientific detection, maintenance equipment, search and rescue, submarine cable repair, underwater tourism, academic surveys, etc. The super rich even use them for underwater Mobile mansion. Submarines are recognized as strategic weapons (especially in disarmament or arms expansion negotiations), and their research and development requires a high degree of and comprehensive industrial capabilities. Currently, only a few countries are able to design and produce them themselves. In particular, ballistic missile nuclear submarines are a key pole of the nuclear trinity. Submarines are also an earlier stealth vehicle. If the noise of a submarine drops to about 90 decibels, it can be "submerged" in the vast ocean background noise, and it cannot be detected by modern sonar.
