What should divers do to manage hydration correctly before diving?

Proper hydration is crucial for divers to ensure their physical condition is optimal and to reduce the risk of decompression sickness. Hydrating with 500 mL of water in the two hours leading up to the dive is an effective way to maintain adequate fluid levels in the body. This pre-dive hydration helps to enhance blood circulation, support bodily functions, and minimize dehydration that can occur during diving due to the pressure changes and exertion involved.

The choice to consume water as opposed to sugary, caffeinated, or alcoholic drinks is essential because carbonated beverages may cause bloating and discomfort during a dive. Increasing caffeine intake can lead to increased urine production, which may result in further dehydration. Alcohol, while it may have a temporary relaxing effect, is a diuretic that can lead to dehydration and impairs judgment, which is not advisable before a dive.

By focusing on water intake in the specified timeframe, divers can effectively manage their hydration levels, ensuring safety and comfort during their diving experience.