Underwater diving hazards

thumb|Illustration in Charles Darwin's [[The Expression of the Emotions in Man and Animals]]

condition in which a disagreement exists between visually perceived movement and the vestibular system's sense of movement

reversible narcotic effects of respiratory nitrogen at elevated partial pressures

bias in which a person's subjective confidence in their judgements is reliably greater than the objective accuracy of those judgements

procedures used by underwater divers to safely manage the decrease in pressure experienced during ascent

unplanned rapid drop in the pressure of a sealed system

neurological and physiological disorder experienced by divers