At the moment, diving is rapidly gaining popularity. Every day the number of divers is only growing. This is a very interesting sport that can reveal the secrets of history, culture and nature to anyone who can overcome fears and dive into the depths of the sea. Do not forget that this is a very dangerous occupation, which often leads to death.

However, such diving was actively used back in the days of Ancient Greece, when it was necessary to get sponges from the seabed or conduct military campaigns. The most famous legend, which is documented by Herodotus, refers to the times of the Greco-Persian war. Xerxes I captured the Greek warrior Silis, who learned from his enemies that a massive attack on the Greek fleet was being prepared. A real Greek could not allow such a thing, so he snatched a knife from one of the soldiers and jumped overboard. He spent some time underwater and the Persians thought he was dead. In fact, he breathed through a reed. With the advent of night, he cut off all the anchor ropes and sailed towards Greece. The historian claims that Silis traveled 13 kilometers before meeting the Greek fleet.

Generally speaking, throughout its history, man has tried to get to know the underwater world, he beckoned him, pulled him to look at his riches. People dived to have fun and feed themselves. However, until scuba diving was invented, such dives were very dangerous. For a long time, a hollow reed was used for breathing. However, with a length of half a meter, breathing is much more complicated. Some peoples practiced diving with an air dome made from a bag, for example. However, long-term stay under water was complicated by the rapid accumulation of carbon dioxide under the dome. By the 16th century, special bells appeared, into which air was supplied by a pump. The technology was not developed, but it allowed considerable time to be spent under water. However, the life of a submariner depended on the activity of people on the surface. A man could dive to 18 meters after the invention of a kind of leather suit, which reduced pressure and did not allow the submariner to freeze. Next in ascending order: hard helmets, ensuring an uninterrupted air supply (1830). All this allowed for a long time with great intensity to work under water.

towards the middle In the 19th century, diving under water was divided into two directions. Technical surveys for scientific diving were supported by the Frenchman Paul Bert and the Scot Scott Haldane. Over time, certain medical indicators for compressed air were established. This led to the introduction of compressed air pumps and carbon dioxide absorbers. The real scuba gear was invented only in 1943. The model was of an open type, i.e. carbon dioxide was released into the aquatic environment. Such aqualungs are still the most popular for recreational or sport diving. At the moment, there are modifications with a closed type of breathing, when the exhaust air is fed back into the breathing circuit, where it is processed, supplemented with fresh air and supplied to a person. Basically, such methods are used in the military industry, since bubbles on the surface can give out a saboteur.

The development of technology required a person to be able to actively work at great depths for a long time. This became possible after the invention of an external source of compressed air. Normally, air is supplied to the regulator through a long hose, but more advanced models supply air directly to the suit. The main area of ​​application is the construction of underwater tunnels and bridges. At great depths, a caisson space is used, when the diver breathes air, the pressure of which is equal to the water pressure at a given depth, but the risk of decompression sickness is still high. More advanced solutions use gas mixtures based on helium and argon.