If the FO2 and MOD on the contents tag reflects a limiting ppO2 of more than 1.4 bar, what should you do?

When the FO2 (fraction of oxygen) and MOD (maximum operating depth) on the contents tag indicate a limiting partial pressure of oxygen (ppO2) exceeding 1.4 bar, it is imperative to act conservatively to ensure safety during a dive.

The ppO2 level of 1.4 bar is widely recognized as the maximum recommended for recreational diving, as higher levels can increase the risk of oxygen toxicity, which poses serious risks including central nervous system effects that can lead to seizures and impaired cognitive function underwater. By disregarding the higher ppO2 indicated and instead adhering to the more conservative value of 1.4 bar, a diver minimizes the risk of encountering these dangers.

This choice aligns with safe diving practices and encourages a thorough review of equipment and planning before undertaking any dive that could potentially expose the diver to elevated risks. Thus, prioritizing safety over the opportunity to dive deeper is crucial in maintaining responsible diving practices.