At a depth of more than 12.5 m, with high external pressure in the blood and tissues, oxygen pressure increases and nitrogen dissolves, this can lead to “deep intoxication” – convulsions, hallucinations. With a slow rise, these symptoms are smoothed out, and with a rapid rise, decompression sickness occurs, the nitrogen in the blood “boils”, its bubbles clog the vessels, which leads to tissue damage, bleeding, paralysis, death; to prevent this, nitrogen in gas mixtures of scuba gear is replaced with helium.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.