In recent years, the People's Navy's main combat equipment has been rapidly upgraded, from small boats to giant ships, from individual soldiers to systems. A modern People's Navy led by the fourth-generation equipment and dominated by the third-generation equipment is taking shape. The Navy's submarine force includes strategic nuclear submarines, attack nuclear submarines and conventional-powered submarines. It is an important underwater assault force and a key development and construction branch of the People's Navy. Military expert Cao Weidong: Our conventional submarines are now equipped with AIP systems, which means they do not rely on air power, so they do not need to surface frequently after diving, and they have better concealment performance underwater. This is a conventional submarine. As nuclear submarines, we have both attack-type nuclear submarines, which are equipped with conventional weapons such as torpedoes and missiles. We also have strategic missile nuclear submarines, which can now carry more strategic missiles, which increases the ability of sea-based strikes, so we have highlights from the perspective of both nuclear and conventional.