Humans are always curious about unknown fields, so in ancient times, Zheng He went to the West, thousands of families flew to the sky, and Xuanzang learned from the scriptures. These are all events in which human beings explore unknown areas, so there is no special study on the depths of our ocean in ancient times, and some people ask how submarines dive and how to withstand the high pressure of water. The submarine dives by gas calibration, and our scientists use a high-pressure resistant alloy steel material as our submarine shell, so our submarine can withstand high pressure in the deep sea.

At first, the submarine dived with heavy objects, and then unloaded the heavy objects to float. Later, scientists found that it is much more scientific to use air to float and sink than to use heavy objects to float and sink, so they set up a sinking box to control the submarine's floating and sinking, making our submarine diving more flexible, controllable and scientific. In order to prevent the hull of our submarine from being squeezed by different internal and external pressures during diving, our scientists used a high-pressure resistant alloy steel, which has strong compression resistance and will not be squeezed even in the deep sea of 3000 feet.

Each of our scientific research projects has been successfully developed after many experiments and overcoming various difficulties again and again. In order to ensure the safety of divers, we will let the dummy dive first, and only after repeatedly confirming that our dummy will not have various accidents will we let the real diver explore the deep sea. So every submarine, spaceship, etc. is difficult to manufacture and put into use. Like our submarine, this material was selected as the shell after repeated experiments.

Since the reform and opening up in China, we have made a lot of scientific and technological achievements, which have been studied by our scientists in China through unremitting efforts. We should pay high tribute to them, instead of following in the footsteps of various stars. Our submarine "Jiaolong" is our country, and we successfully dive through constant experiments.