Did you know already?
Why is it more difficult to breath upside down?
As long the lungs are on the same depth as the mouth, it’s easy to breath underwater.
But if you are upside down in the water, your regulator is around 20 cm deeper than your lungs.
You have to compensate the pressure through heavy inhaling through the regulator.
That’s why it feels more difficult to breath upside down in the water.
Equalization. How we can easily prevent squeezes? Simple, we have to add air to air spaces as we descent. This keeps the pressure equal with the outside pressure. To equalize the sinuses and ears, pinch you nose and blow very gently against it or wriggling the jaw side to side. but swallow also works.
The Air, which we are using underwater is the same air we breathing on the surface. The contents are 78% Nitrogen, 21% Oxygen and 1% noble gases.
If you compare to the air we breathing in, the air we breathing out do have still 17% oxygen and 4% carbon dioxide. Nitrogen is still 78%, because it’s an inert gas.
Dehydration! Our bodies are made up of 70% water, but even a 2% loss of water in the body can result in up to a 10% reduction in physical performance due to dehydration. The muscles do not work well, which can leave you vulnerable to a variety of injuries. This is an important consideration for Scuba Divers, as dehydration can affect the body’s ability to Decompression Sickness (DCS), increased fatigue and, in extreme cases to a physical collapse. Staying hydrated is a balancing act between the body fluids and the essential salts in the cells and blood plasma that play an important role in the proper functioning of the human body. When the body loses more fluids than it takes in, dehydration occurs. There are a number of factors which can contribute to this phenomenon, such as illness, hot dry climates, prolonged exposure to heat or sun and insufficient fluid intake or the use of diuretics.How we can prevent the dehydration? Many ways, but the most important way is, drink plenty of water or non-diuretic fluids and avoid alcohol and caffeine.
Colors appears underwater different. So you will find out that wetsuits or BCD’s which looks colorful on the surface, looks totally different under water.
As well corals and fish do not have those nice colors like on photos you have seen them before.
The reason why is easy. The water absorbs the light. The deeper you are going, the more the colors will disappear because of the amount of water above you. Red color already starts on 5 meter to disappear.
The Medical First Aid is the most important thing you can do, if you are coming to an accident to help other people.
In this case we take the first four letters from the ABCD to remind it easily what our steps are.
Airways, Breathing, Circulation, Defibrillation