What is the maximum recommended ascent rate?

The maximum recommended ascent rate for divers is generally around 5 to 10 meters (15 to 30 feet) per minute. This standard is in place to allow for the safe release of nitrogen that the body has absorbed during a dive, helping to prevent decompression sickness, also known as "the bends." Ascending too quickly can cause nitrogen bubbles to form in the bloodstream and tissues, which can lead to serious health complications.

While the options you provided suggest alternative ascent rates, the correct range aligns with the current best practices for safe diving. Recommendations emphasize gradual ascent, particularly in the last 5 to 6 meters (15 to 20 feet), where a slower ascent rate is especially critical. Additionally, many training agencies advocate a safety stop during ascent to further reduce risk, often at a depth of 5 meters (15 feet) for a duration of 3 to 5 minutes.

Overall, maintaining a maximum ascent rate of 5 to 10 meters per minute is crucial for diver safety and is a standard practice outlined in diver training programs.