**5. Pathophysiology**

There are many variables that affect the susceptibility of the person to nitrogen narcosis. Diving health, deep diving experience, working conditions, environmental conditions are some of these. As the depth increases, the diver starts sign of the suppressing. Thinking problems, deterioration of time perception, deterioration of decision-making, memory problems, motor and mental functions, and the prolongation of reaction time are some of these [5].

When the diver starts to exit, the symptoms disappear quickly; sometimes, it does not remember what you are doing underwater during nitrogen narcosis.

There is no direct pathological change to acutely CNS oxygen poisoning in humans. In animal experiments, tissue death was demonstrated in the nervous system. Serious exposures can cause damage to the brain and spinal cord in the spinal cord. Even a 30-min dive with 4 ATA pure oxygen (30 m) can cause structural changes in the gray matter in the spine of front horn [7].
