Which sequence represents a typical emergency ascent procedure?

• A. Confirm oxygen supply status; signal readiness; execute controlled ascent; monitor depth; reach surface with appropriate stops.
• B. Immediately surface without stops; assess at surface.
• C. Signal for assistance and wait for guidance before ascending.
• D. Ascend rapidly to minimize time underwater.

Answer: (A)

In an emergency ascent, the priority is to move upward in a controlled, communicative way that protects the diver from rapid pressure changes and decompression risks. The best sequence starts by confirming the oxygen supply status so you know whether supplemental oxygen is available if needed after surfacing. Next, signal readiness to your buddy or surface so there’s clear communication about the ascent. Then execute a controlled ascent, keeping a steady, safe ascent rate and continuously monitoring depth to avoid lung over-expansion injuries. As you approach the surface, reach it with appropriate stops (a short safety stop if possible) to off-gas and reduce decompression risk. This approach combines readiness, communication, controlled buoyancy management, and safe off-gassing, which is essential for a safe emergency ascent.

Options that skip or delay any of these steps—such as surfacing immediately without stops, waiting for guidance before ascending, or ascending rapidly to minimize time underwater—do not provide the same protection against decompression illness or barotrauma and therefore are not appropriate.