What is considered to be the cause of narcosis?

Narcosis, often referred to as "the rapture of the deep," is primarily caused by the interference with chemical neurotransmitters in the brain due to increased partial pressures of certain gases, particularly nitrogen. As a diver descends deeper and the pressure increases, nitrogen from the breathing gas becomes more soluble in the body’s tissues and fluids, including the brain. This heightened concentration of nitrogen can disrupt normal synaptic transmission and neurotransmitter activities, leading to symptoms such as impaired judgment, euphoria, and difficulty with motor skills.

Understanding this mechanism is crucial for divers to recognize the risks associated with deep diving and to manage their diving profiles accordingly to minimize the likelihood of narcosis. Awareness of the effects of heightened gas pressure on brain function allows divers to make informed decisions about their limits and safety during dives.