The mysterious underwater world is always fascinating. Many outdoor enthusiasts are fascinated by diving. However, as an activity with a higher risk factor, before diving, you must know some common sense: the necessary learning to dive in the sea includes How to use breathing tubes and regulators, how to rest on water, how to deal with emergencies, etc.
The preparation before entering the water is very important. Personally check whether the equipment is functioning properly, and check each other again. Entry posture: Frontal upright diving-the water depth needs to be above 1.5 meters, with your feet open back and forth, hold the mask with one hand, and press the air cylinder strap with the other. Sit back into the water-sit on the boat with your back facing inwards and lean back into the water.
Sitting frontally into the water-for beginners. Go sideways into the water-float on the inflatable boat and roll into the water. Diving: B.C. (buoyancy regulator) method-when using a buoyancy regulator, with a counterweight belt, it can be used for diving above and below the feet. No need to B.C.-head down and feet up. Ascend: Control the ascent speed within 18 meters per minute. Simply put, don’t exceed the ascent speed of the bubbles you exhale; don’t stop breathing; when ascending, look up at the water surface, you can extend your right hand to specify the direction, pay attention to the back, the body rotates slowly .
The following patients are not suitable for diving: colds, nervousness, ear and nose diseases, heart disease, high (low) blood pressure, drunkenness, diabetes.
The difference between snorkeling and scuba diving: Scuba diving scubadiving refers to a long-term diving method in which divers carry an oxygen cylinder and use the oxygen in the cylinder to breathe.
Snorkeling skindiving is a method of snorkeling in the time that the diver can hold his breath; until he can no longer hold his breath to surface. Rules for scuba diving: Two persons traveling together. Principle: Two persons must be together from entering the water to going ashore; the instructor must not allow their companions to go ashore on their own; the two keep in touch frequently.
Responses when placing an order: keep calm, float up a few meters, and look for a companion; when you can’t find it, come up to the surface and watch for bubbles. More than ten minutes, there is still no trace of the companion, should return to the entry point. If it is not necessary, please do not hunt water animals. Check the residual pressure gauge margin every ten meters. Several general gestures: I’m in good condition now—“OK”, pay attention to the direction of the (object)—“index finger indicates the direction”, float up—“right hand fist, thumb up”, dive—“right hand fist , Thumbs down”.
Adjust ear pressure: For those who are diving for the first time or for a short time, the pressure of water will make the ear canal feel uncomfortable and even painful. At this time, you should pinch your nose with your hands and inflate into the nasal cavity forcefully, so that the air pressure in the ear canal will increase and offset the water pressure. If you dive down again, the pain in the ear canal is unbearable, so you should go up immediately and don’t try to be aggressive.