What is a common guideline for the ascent rate from deep dives?

The recommended ascent rate from deep dives is typically no faster than 9 meters (30 feet) per minute. This guideline is established to minimize the risk of decompression sickness, also known as "the bends," which can occur when ascending too quickly from depths where increased pressure affects nitrogen absorption in the body.

By ascending within this rate, divers allow sufficient time for nitrogen, which has dissolved in their tissues under pressure, to safely off-gas during the ascent. This gradual ascent also provides an opportunity for safety stops at specified intervals, further reducing the risk of decompression illness. The emphasis on a controlled ascent rate ensures that divers maintain their safety and health while exploring deeper underwater environments.

Understanding this guideline is crucial for maintaining the physiological safety of divers as they navigate the potentially hazardous conditions encountered during and after deep dives.