The continent on which we live has always been surrounded by the sea, and human beings have never stopped exploring the sea, and various diving activities have never stopped. From shallow water diving that can only be carried out with oxygen cylinders, to deep sea diving that needs to be carried out with mixed gas, to super deep sea diving that can only be carried out with large submarines, there are always so many secrets of the ocean! There are many kinds of gases that can be used as diving gas, such as hydrogen, nitrogen, oxygen, helium, etc. Among them, helium diving is widely used by global diving enthusiasts. Why use helium diving? What are the advantages of helium diving that make everyone like diving with helium oxygen mixture? How many advantages do you know about helium diving?

As we all know, when we are on land, the oxygen we are exposed to is about 0.21 atmospheric pressure, but the density of sea water is high, so we need to bear much more pressure when diving than when we are on land. When the water depth is 100 feet, we need to face 3 to 4 times the atmospheric pressure, while when the water depth is 300 feet, it is 10 times. At this time, the diver's ears and lungs will be under great pressure. If no measures are taken, it will cause tinnitus, deafness, dizziness, chest tightness, dyspnea, even confusion and coma! At this time, if you still use air with ordinary pressure, it is very dangerous. At this time, the advantages of helium diving are outstanding! The use of high-pressure helium oxygen mixture can help divers better adapt to the deep-sea pressure, and the helium oxygen mixture is less dense, making it easier for divers to breathe in. One of the advantages of helium diving is that it is convenient for divers to breathe!

We know that diving gas is not only helium, but also nitrogen and hydrogen. But why is helium (which is not industrial helium) widely used? The second advantage of helium diving is safety! Although the economic cost of nitrogen oxygen mixture is low (nitrogen is relatively cheap), the use of nitrogen during deep-sea diving is likely to cause the risk of nitrogen intoxication and oxygenation for divers. There is too much nitrogen in the body, and the pressure in the deep sea is very high. In addition to entering the lungs, nitrogen may also enter the blood vessels with the help of the pressure. The diver will be like drunk, with unexplained ecstasy, loss of judgment, imbalance of hands and feet and other symptoms, which is very dangerous! The advantage of helium diving is safety! Helium is an inert gas, and its solubility in the blood is less than that of nitrogen, so divers will not be "drunk"!

The third advantage of helium diving is that it can reduce decompression time and reduce the occurrence of decompression sickness. Everyone knows that decompression sickness is a common disease in diving. As the diver returns to the sea from the bottom too quickly and for too short a time, the pressure drops suddenly, and the diving gas is released from the body into insoluble bubbles that block the blood vessels, causing joint pain and muscle soreness. In serious cases, the central nervous system is blocked, causing paralysis or even death! The time of safe decompression is closely related to the type of diving gas used, the depth of diving and the diving time. With the same diving depth and time, helium diving has obvious advantages, which can reduce the decompression time and enable divers to return to the sea faster under the premise of health and safety.

The fourth advantage of helium diving is that it can increase the depth of diving. Due to the low density of helium, it can be absorbed by the human body faster, and it can also be eliminated from the body faster than nitrogen. The diving depth can be appropriately improved by reducing the oxygen content. Of course, the thermal conductivity of helium is also one of the reasons for the greater depth of helium diving.