What defines the No-decompression Limit in diving?

The No-decompression Limit (NDL) refers specifically to the maximum amount of time a diver can spend at a certain depth without needing to perform a mandatory decompression stop during their ascent to the surface. This concept is crucial for preventing decompression sickness, which can occur when a diver ascends too quickly after spending time at depth.

When a diver exceeds the No-decompression Limit, they must take safety stops during their ascent to allow the body enough time to eliminate dissolved nitrogen safely. The dive tables or dive computer will help divers calculate the NDL based on depth and time to ensure they can surface safely without deco stops.

Understanding the No-decompression Limit is essential for divers to ensure their safety while maximizing their enjoyment of the dive, making it a key part of diving training and practice. Other options relate to depth limits or ascent procedures, but they do not accurately define the NDL in terms of dive duration and the requisite safety protocols associated with it.