Which of the following is a sign that a diver may be experiencing oxygen toxicity?

Loss of motor coordination is a key sign that a diver may be experiencing oxygen toxicity. As divers breathe an increased partial pressure of oxygen, particularly when using enriched air (Nitrox) at deeper depths, they may encounter toxic effects. One of the neurological effects of oxygen toxicity is the impairment of motor skills and coordination. This can manifest as clumsiness, difficulty in controlling movements, or an inability to respond appropriately to underwater stimuli, putting the diver at risk for accidents or injury in the water.

In contrast, the other options do not indicate oxygen toxicity. Weightlessness can be experienced by all divers due to the buoyancy of water, and it’s not a specific sign of oxygen toxicity. Warmth and comfort in the water can signify good thermal protection and is a positive experience for divers, bearing no relation to oxygen toxicity. Cognitive clarity typically implies normal mental function, while oxygen toxicity often leads to confusion or altered mental states, making this option incompatible with the symptoms of oxygen toxicity. Understanding these signs is crucial for divers to ensure safety underwater and respond promptly to any symptoms that could indicate oxygen toxicity.