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Freediving is a type of underwater diving while holding your breath. This is its main difference from diving. A person does not use oxygen tanks and can stay underwater only as long as his own body allows him.
How deep can we dive? Can we obtain some of our new reflexes? Eventually, we start getting them by training. History knows how to do it for sure.
Freedivers are able to anticipate these changes and use them to dive deeper and stay underwater longer. Representatives of ancient civilizations knew about the main switch of life and used it for centuries to extract sponges, pearls, corals, and food at a depth of tens of meters.
Europeans who in the seventeenth century happened to visit the Caribbean, the Middle East, the Indian Ocean, and the South Pacific Ocean reported that in front of their eyes the locals dived more than thirty meters and remained underwater for up to fifteen minutes, making the only inhale.
But most of these testimonies are several hundred years old, and no matter how secret knowledge in the field of deep diving these people possessed, their secrets were lost for centuries.
How Does It Work?
In our physiology, at first, we are like fish. In a month-old embryo, it is not the legs that grow at first, but the fins; as for the hands, they are separated from the transformation into fins by only one gene. The heart of the fetus in the fifth week has two chambers, which is typical for fish.
The chemical composition of human blood is surprisingly similar to seawater. A baby will reflexively breaststroke when placed in water. One of the interesting facts is that the baby can hold their breath for 40 seconds without any effort. We lose this ability only when we start walking.
As we grow older, we develop amphibious reflexes that allow us to dive to unimaginable depths. Such pressure, as at these depths, could cripple or kill us on land. But not in the ocean. The ocean is a different world with different rules. To understand it, you need to think differently.
The deeper we go, the more unusual everything becomes. When you are at depths of several tens of meters, the relationship between man and the ocean is felt on a physical level: you feel it in the salty taste of blood, you see it in the gill-like arches of an eight-week-old fetus, you notice it in the amphibian reflexes common to humans and marine mammals.
To survive in a world where there is no light, in conditions of cold and high pressure, animals such as sharks, dolphins, and whales have developed additional senses that allow them to navigate, interact with each other and see.
Deep In The Sea
At sea level, we are who we are. Blood flows from the heart to the organs and limbs. The lungs take in air and exhale carbon dioxide. The synapses in the brain transmit signals at a rate of about eight pulses per second. Heart rate – from 60 to 100 beats per minute. We see, touch, smell, hear and taste. Our bodies are used to living on or above the surface of the water.
At a depth of about 20 meters, we are no longer quite us. The heart beats twice as slow. Blood begins to drain sharply from the limbs, rushing to more important internal organs. The lungs shrink to a third of their normal size. Feelings are dulled. The brain feels the heaviness and slows. Most people are able to dive to that depth and feel these changes in their bodies. And some dive even deeper.
Originally posted 2022-09-30 20:11:02.