A diver with group letter 'F' performing a 60 ft dive has a residual nitrogen time of 35 minutes.

A diver with group letter 'F' performing a 60 ft dive has a residual nitrogen time of 35 minutes.

• A. 15 minutes
• B. 25 minutes
• C. 5 minutes
• D. 35 minutes

Answer: (D)

Residual nitrogen time is the nitrogen still in your tissues from a previous dive that must be accounted for on a subsequent dive. It’s determined by depth and your nitrogen loading category, and it reduces the no-decompression allowance for the next dive because that nitrogen is already present in your body. In this scenario, after a 60 ft dive, a diver in group F has a residual nitrogen time of 35 minutes. That 35 minutes is the amount of nitrogen time you carry into planning the next dive at that depth. So the correct interpretation is that the residual nitrogen time is 35 minutes.

Residual nitrogen time is the nitrogen still in your tissues from a previous dive that must be accounted for on a subsequent dive. It’s determined by depth and your nitrogen loading category, and it reduces the no-decompression allowance for the next dive because that nitrogen is already present in your body.

In this scenario, after a 60 ft dive, a diver in group F has a residual nitrogen time of 35 minutes. That 35 minutes is the amount of nitrogen time you carry into planning the next dive at that depth. So the correct interpretation is that the residual nitrogen time is 35 minutes.