If you experience symptoms of oxygen toxicity while diving, what should you do?

Experiencing symptoms of oxygen toxicity while diving is a serious situation that requires immediate action. Ascending immediately and ending the dive is the correct course of action because the effects of oxygen toxicity can escalate quickly and may lead to seizures or loss of consciousness.

When a diver begins to experience symptoms—such as visual disturbances, nausea, twitching, or any other neurological symptoms—these could indicate that the partial pressure of oxygen in the body is too high, which can have severe consequences. Rapid ascent decreases the partial pressure of oxygen, helping to relieve the condition and minimize the potential for life-threatening injuries.

While signaling for assistance or taking a break might seem like valid options, they do not address the immediate danger posed by oxygen toxicity. Continuing the dive or delaying ascent can lead to further complications and risks to safety. Consequently, ending the dive promptly by ascending is the most effective and recommended response.