What is the risk associated with not respecting the maximum allowable bottom time during dives?

The risk associated with not respecting the maximum allowable bottom time during dives is primarily decompression sickness, often referred to as "the bends." When divers spend too much time at depths beyond their no-decompression limits, they may accumulate excessive nitrogen in their bodies. During a dive, as a diver descends, the pressure increases, allowing their body to absorb more nitrogen from the breathing gas. If a diver ascends too quickly or remains too long at depths that exceed their limits, the nitrogen that has been absorbed can form bubbles in the tissues and bloodstream when pressure decreases, leading to serious health issues known as decompression sickness.

This condition can manifest in various symptoms, from joint pain and dizziness to severe neurological issues, depending on how much nitrogen is released and where bubbles form in the body. Therefore, adhering to the guidelines for maximum allowable bottom time is crucial for safety, as it helps to manage nitrogen absorption and reduce the risk of bubbles forming during ascent.

Understanding this concept emphasizes the importance of following dive tables or using dive computers correctly to ensure a safe and enjoyable diving experience.