Crew must not undertake no-compression scuba diving less than ____ hours before duty.

Crew must not undertake no-compression scuba diving less than ____ hours before duty.

• A. 24 hours
• B. 12 hours
• C. 48 hours
• D. 72 hours

Answer: (A)

After scuba diving, nitrogen absorbed in the tissues needs time to off-gas before exposure to lower cabin pressures during flight. For no-decompression dives, the minimum safe interval before duty is 24 hours. This waiting period gives the body enough off-gassing time to reduce the risk of decompression sickness when pressure drops at altitude. Choosing a shorter interval, like 12 hours, doesn’t provide sufficient off-gassing, which is why it’s not appropriate. Longer waits, such as 48 or 72 hours, are reserved for more complex dives that included decompression stops or multiple dives, which require extra off-gassing time.

After scuba diving, nitrogen absorbed in the tissues needs time to off-gas before exposure to lower cabin pressures during flight. For no-decompression dives, the minimum safe interval before duty is 24 hours. This waiting period gives the body enough off-gassing time to reduce the risk of decompression sickness when pressure drops at altitude. Choosing a shorter interval, like 12 hours, doesn’t provide sufficient off-gassing, which is why it’s not appropriate. Longer waits, such as 48 or 72 hours, are reserved for more complex dives that included decompression stops or multiple dives, which require extra off-gassing time.