Need to learn: including the use of breathing tubes and regulators, water rest methods, emergency handling and so on. For the preparation work before entering the water, check whether the equipment function is normal and check with the other party again.
Entry posture: dive straight ahead-the water depth should be above 1.5m, with your feet spread back and forth, with one hand pressing the mask and the other pressing the cylinder belt. Sit with your back to the water-sit in the boat face in and dive on your back. Sit in the water-suitable for beginners. Go sideways into the water-then float on the rubber boat and roll into the water.
Diving: B.C. (Buoyancy Regulator) method-Buoyancy Regulator, with counterweight belt, diving from head to toe. No, BC-head, feet.
Rising: the rising speed should be controlled within18m per minute, in short, it should not exceed the rising speed of bubbles exhaled by yourself; Don't stop breathing; When you rise, look up at the water. You can extend your right hand to indicate the direction. Pay attention to your back and rotate your body slowly.
The original intention of diving is to enter the water surface for underwater survey, salvage, repair and underwater engineering with or without professional tools. Post-diving has gradually developed into a leisure sport with underwater activities as the main content, so as to achieve the purpose of physical exercise and leisure and entertainment, which is widely loved by the public.
After entering the Internet era, with the continuous popularization of network applications, the public has given diving a new meaning, that is, a single individual or behavior that secretly watches * * * to enjoy information or leave messages without others knowing, and does not actively expose his identity, release information or reply to others' information. However, from a geographical point of view, diving also refers to groundwater buried above the first aquiclude. Now it is gradually used in the network.
Reference: Baidu Encyclopedia Diving