If divers experience symptoms of oxygen toxicity during a dive, what should they do?

Experiencing symptoms of oxygen toxicity can be a serious and potentially life-threatening situation while diving. The appropriate response is to ascend immediately to a shallower depth and seek assistance. This is critical because oxygen toxicity can lead to seizures, loss of consciousness, and other severe complications that can jeopardize the diver’s safety. By ascending to a shallower depth, the diver decreases the partial pressure of oxygen they are exposed to, thereby mitigating the symptoms of toxicity.

Seeking assistance after ascending is also important, as trained professionals can provide guidance, manage the situation, and ensure the diver's safety. This combined approach increases the chances of a safe and effective resolution to the issue.

In contrast, changing the dive plan or continuing to monitor symptoms without taking action could exacerbate the situation, as oxygen toxicity effects could worsen or become unmanageable. Just switching to regular air without first ascending does not address the immediate risk associated with elevated oxygen levels at depth.