Why are divers advised to smoothly ascend to the surface? Why is a sharp rise dangerous?

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.

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