How long do you have to wait on the surface before flying after an O2 dive?

• A. 6 hours
• B. 12 hours
• C. None
• D. 24 hours

Answer: (C)

Using oxygen for decompression reduces nitrogen loading in the tissues, so there isn’t a residual gas burden to off-gas after surfacing. Because of that, there is no required waiting period before flying after an O2 dive—you can fly as soon as you’re on the surface and feel well. If you have any symptoms of decompression sickness, don’t fly, and always follow airline or dive-program policies. Other options reflect standard no-fly times after air dives, but those aren’t applicable to a pure O2 dive.