What is the importance of a proper safety stop when using Nitrox?

A proper safety stop is crucial when using Nitrox, primarily for its role in facilitating the off-gassing of nitrogen and preventing decompression sickness. During a dive, especially when using Nitrox which has varying oxygen and nitrogen content compared to air, the body absorbs different amounts of nitrogen depending on the depth and duration of the dive. As divers ascend, it is essential to allow for a gradual reduction in pressure, which helps the body safely expel the absorbed nitrogen.

A safety stop typically occurs at around 15 to 20 feet (or 5 to 6 meters) for 3 to 5 minutes after completing the dive, providing this crucial time for nitrogen to be released from the tissues into the bloodstream before reaching the surface. Failing to perform a safety stop can increase the risk of decompression sickness because of the rapid ascent, which does not allow for adequate off-gassing.

The knowledge of handling Nitrox effectively acknowledges that while it may reduce nitrogen exposure during the dive, proper ascent procedures including safety stops are mandatory to ensure divers can safely surface without complications.