Why is "No Decompression Limit" (NDL) important when diving with Nitrox?

The concept of "No Decompression Limit" (NDL) is crucial for divers using Nitrox because it sets a clear guideline on how long they can remain at a specific depth without requiring decompression stops during ascent. When diving, especially with Nitrox, managing nitrogen absorption and the associated risk of decompression sickness is vital. The NDL provides a time limit that ensures divers can ascend directly to the surface without having to stop at certain depths to off-gas nitrogen. This simplifies dive planning and enhances safety by reducing the complexity of dive profiles, particularly for recreational divers who may prefer to avoid the risks and complications associated with decompression stops.

In contrast, the other options relate to different aspects of diving that do not directly connect to the critical aspect of the NDL regarding ascent and decompression safety. They involve elements like depth requirements and planning for emergencies that, while important, do not specifically address the purpose of NDL in avoiding decompression sickness during a Nitrox dive.