According to IANTD air dive tables, what is the no-decompression limit (NDL) for an air dive at 30 meters?

The no-decompression limit (NDL) represents the maximum time a diver can spend at a given depth without requiring mandatory decompression stops during ascent. For a dive at a depth of 30 meters, the NDL is critical for ensuring diver safety by preventing decompression sickness.

In the case of a dive at 30 meters, the correct NDL is indeed approximately 20 minutes according to standard air dive tables, which aligns with the physiological limits on nitrogen absorption in the body at this depth. Upon ascending beyond this timeframe, the diver would need to perform decompression stops to allow for the safe expulsion of nitrogen from their system to avoid the risk of decompression sickness.

Understanding this limit is essential for divers, as exceeding the no-decompression time can lead to serious health risks, highlighting the importance of adhering to established dive tables and protocols during underwater activities.