Free diving refers to diving as deep as possible only by self-adjusting abdominal breathing and holding your breath without carrying a gas bottle. Free diving includes free diving activities such as entertainment, experience, photography and hunting, as well as extreme breath-holding deep diving of competitive nature.
The earliest origin of free diving can be traced back to ancient times. In order to survive, people hold their breath, dive into the sea to touch snails, catch crabs and fish with homemade harpoons. In ancient times, due to the lack of oxygen supply equipment, the technology was backward, especially the fishermen who lived on the island all the year round. They held their breath and made a living by fishing in the sea.
Later, some people who love this sport gradually systematized and specialized, and created the extreme sport of free diving. Many countries still retain the ancient traditional custom of holding their breath and diving to eat seafood, such as Japan, South Korea (sea girl) and many small tropical island countries.
With the continuous promotion of the national strategies of "Belt and Road" and "maritime power" and the gradual implementation of the national strategy of national fitness and health in China, with the improvement of residents' income and living standards, more and more people began to pursue entertainment and stimulate consumption. Free diving is gradually popularized in public life and will usher in new development.
Potential danger:
Free diving is undoubtedly very dangerous, and drowning is one of the risks. When divers dive, seawater will exert great pressure on their lungs, and some people may even have so-called "shallow water fainting", and lose consciousness when approaching the water surface during floating. This sport requires high physical fitness, but it also requires strict personal attention. You must get rid of all distractions and devote yourself to diving.
When diving, the capillaries of the human body contract, blocking the flow of blood from the heart to the end of the body, leaving more oxygen and blood in the heart and brain. When approaching the water surface, the capillaries begin to expand again, and blood begins to flow from the brain to the limbs. In this process, lack of oxygen in the brain can easily cause fainting.