How long must a diver be under direct observation immediately after a dive?

• A. The diver shall remain under direct observation for 10 minutes post dive and 30 minutes of travel time for at least 2 hours after surfacing.
• B. Observation is not required.
• C. The diver must be observed for 60 minutes after surfacing.
• D. Observation is required for 15 minutes only.

Answer: (A)

Post-dive observation is about guarding the diver against symptoms that can develop after surfacing, especially in high-risk operations like EOD diving where exertion and equipment conditions can influence safety. The rule requires keeping the diver under direct observation for 10 minutes right after the dive, continuing through a 30-minute travel period, and maintaining monitoring for at least two hours after surfacing. This approach covers the immediate period when bubbles may form during or right after ascent, during the initial move to a safer area, and throughout a window when late-developing symptoms of decompression sickness can appear. In practice, it ensures early detection and rapid response if anything unusual shows up, which is crucial for timely treatment and safety.

Other options suggest either no observation, a shorter single window, or an entirely different duration, but those do not provide the same level of protection. Observing for only a short period or not at all could miss symptoms that emerge after the initial post-dive phase, whereas the specified two-hour total observation window plus the immediate 10-minute and travel monitoring collectively offer a safer, more comprehensive oversight.