| When diving, there is the risk of nitrogen narcosis, air embolisms, decompression sickness-bends, ruptured eardrums and drowning. |
| Inhalation of high vapor concentrations can cause central nervous system depression and narcosis. |
| Produces severe narcosis of tissue, which may not appear until several hours after exposure. |
| Symptoms of narcosis make the ascent challenging, but other hazards await a diver. |
| Most PHCs are understood to act as threshold toxins, eliciting general narcosis symptoms. |
| Avoid alcohol or drugs before diving, as this increases the effects of narcosis. |
