Which statement correctly describes where the maximum safe ascent rate is defined?

• A. Dive Plan or decompression schedule defines ascent rate (typical 9–12 m/min), with stops as required.
• B. The dive computer automatically sets the rate based on depth.
• C. The open-water rescue plan determines the ascent rate.
• D. The surface supervisor’s briefing determines the ascent rate and stops.

Answer: (D)

The maximum safe ascent rate is determined by the surface supervisor during the pre-dive briefing. In professional diving, the supervisor coordinates the dive plan, monitors conditions, and prescribes the ascent rate and required safety stops to ensure a safe return to the surface. While the dive plan or decompression schedule outlines the overall profile and a computer can provide individual dive data, the approved ascent rate and stops come from the supervisor’s guidance to the team. The open-water rescue plan or a computer setting do not define the standard ascent rate for the operation.