Look at the flood dragon

Answer 1

The Jiaolong manned submarine was China's first self-designed and self-integrated deep-sea manned submarine. The research and development work began in 2002, and the assembly was completed on September 1, 2007. In August 2009, the 1000-meter and 3000-meter sea trials were carried out. On June 27, 2012, the diving depth reached 7062 meters, creating the world's record for the largest diving depth of similar operational submarines, making China the fifth country after the United States, France, Russia and Japan to master the deep diving technology.

It was 8.2 meters long, 3.0 meters wide, and 3.4 meters high. It weighed no more than 22 tons, had a maximum load of 240 kilograms, a maximum speed of 25 nautical miles per hour, and a cruising speed of 1 nautical mile per hour. It carried three people and was designed to dive to a maximum depth of 7000 meters. It could move freely in the sea area that occupied 99.8% of the world's ocean. The system included the main body system of the manned submarine, the surface support system, the mother ship modification system, and the submarine training system. There were three major technological breakthroughs: near-bottom automatic navigation, deep-sea hovering positioning, and high-speed underwater sound communication.

Dragon had a titanium alloy shell with a thickness of 70 millimeters and three observation windows made of pure glass. It controlled its movement up and down through the ballasting iron, and the design of the ballasting iron was very exquisite. It was equipped with a domestic sonic system that could solve the problem of sound signal extraction. Sonar could accurately emit and identify signals and explore the surrounding terrain. There was also a domestic ultra-short baseline positioning system that provided underwater positioning and navigation services. There were also two sets of oxygen supply systems inside, which could guarantee the safety of three people for 84 hours. On August 18, 2024, the 300th dive was completed in the Western Pacific Ocean. Since the first dive on August 3, 2009, 300 dive missions have been completed in the Pacific Ocean, Indian Ocean, and Atlantic Ocean, with a total of 900 people diving.

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