A person weighing 5 kg jumps from 1 m, and the impact when entering the water is almost the same as being overwhelmed by a person weighing 25 kg.

Different parts of the human body can bear different pressures, and the most vulnerable part is the human head. Its maximum bearing capacity is 22-8 kN, and the maximum acceleration it can bear is 82-6 gravity accelerations. The extreme diving height of a 5 kg person is only 2 meters.