Great white sharks can dive below 1 km, and gray sharks (not to be confused with gray reef sharks) like to stay 2 km below the sea surface, but we don't have to dive that deep, because we can hardly see our fingers when we are only a few hundred meters underwater.
The depth limit of human freehand diving is 100 meters. For the average person, the limit depth of diving is around 10 meter, and professional divers will dive to 15 meter or even deeper. The current record of unrestricted free diving is 249 meters. Diving is a leisure sport with underwater activities as the main content, in order to achieve the purpose of physical exercise and leisure and entertainment. It is basically impossible to dive to the bottom of the sea and see sharks.
Precautions for deep diving
1. If you are a beginner, diving is a very difficult sport for you. It is best to find relevant institutions for training. You should start diving at a high level and learn slowly.
2. When diving, you must follow the principle of two people walking together. With the coach, always keep in touch with the coach's gestures.
3. Try to choose regular and safe waters for diving, and try not to find some cheap waters because of the price, because there is no safety guarantee.
4. Before diving, be sure to wear the equipment, check whether the equipment is qualified and the function is normal, and learn the use of breathing tubes and regulators, the rest method of water, and the handling of emergencies. Of course, two people can help each other check the equipment.
Learn to use equipment when diving, especially don't use earplugs when diving under the sea. Because the pressure of water compresses the eardrum, it will make the ears feel tingling, but don't worry, just master a few simple methods to adjust the ear pressure before going into the water.