What happens if a diver exceeds the recommended limits of PO2?

Exceeding the recommended limits of partial pressure of oxygen (PO2) can lead to significant health risks, primarily due to oxygen toxicity. When divers breathe gases with high concentrations of oxygen, particularly above the safe levels established for various depths, they increase their risk of developing convulsions and other dangerous physiological effects.

Oxygen toxicity can manifest in different forms, including central nervous system (CNS) toxicity, which can cause visual disturbances, seizures, and even unconsciousness. These symptoms can pose an immediate threat to divers, potentially leading to loss of control while underwater, which is critical in a high-risk environment like diving.

Understanding the implications of elevated PO2 is essential for divers to avoid potentially life-threatening situations. The recommended limits are based on research and experience to ensure divers remain safe during their underwater activities.