What is the maximum time for a no-decompression limit at 12 meters (40 feet)?

The maximum no-decompression limit at a depth of 12 meters (40 feet) is indeed 60 minutes. This limit is significant because it allows divers to stay at a certain depth without the need for mandatory decompression stops during ascent. Understanding these limits is crucial for safety during diving activities.

At 12 meters, the physiological requirements of the human body concerning nitrogen absorption limit the duration that a diver can spend at this depth without exceeding safe nitrogen saturation levels. This boundary is part of the dive tables and is designed to prevent decompression sickness (DCS).

The options related to 20 minutes, 90 minutes, and 120 minutes do not reflect the established no-decompression limits for recreational diving at this depth and would require the diver to include decompression stops upon ascent, which could increase risks if not carefully managed. Thus, a dive duration of 60 minutes is the maximum time allowed under no-decompression status at 12 meters, ensuring divers can ascend safely and effectively.