What condition must be avoided when diving with Nitrox to prevent issues?

When diving with Nitrox, it is crucial to avoid rapid ascension due to the increased risk of decompression sickness (DCS). Nitrox, a breathing gas mixture that typically contains a higher percentage of oxygen and a lower percentage of nitrogen than air, is designed to minimize nitrogen absorption at depth. However, when a diver ascends too quickly, the body does not have adequate time to off-gas the absorbed nitrogen safely, which can lead to nitrogen bubbles forming in the tissues or bloodstream, resulting in DCS.

Diving with Nitrox can allow for longer bottom times and potentially longer dwell times at depths because of the reduced nitrogen content. However, even with these benefits, proper ascent rates are essential to prevent the build-up of nitrogen in the body. Following the recommended ascent rate guidelines is crucial, as it promotes safe off-gassing and minimizes the risk of DCS.

In contrast, while low visibility, extreme cold, and high temperatures can pose challenges during dives and can affect a diver's safety, they do not specifically relate to the physiological effects of gas absorption and off-gassing that are particularly relevant to Nitrox diving. Therefore, maintaining an appropriate ascent rate is fundamental when using this gas mixture to ensure a safe diving experience.