Why is it important to stay hydrated before diving?

Staying hydrated before diving is critical to prevent decompression sickness, which is often referred to as "the bends." When a diver descends underwater, the pressure increases, and if they are dehydrated, the body is less able to manage nitrogen levels effectively. Dehydration can reduce blood volume, leading to poor circulation and making it more difficult for the body to expel nitrogen when ascending. When a diver ascends, the nitrogen that has accumulated in their tissues needs to off-gas safely; if the body is not sufficiently hydrated, this process can be impeded, increasing the risk of nitrogen bubbles forming in the bloodstream or tissues, resulting in decompression sickness. Therefore, adequate hydration supports the body’s physiological functions, allowing for a safer diving experience.