SSI Science Of Diving Practice Exam

A dive is classified as a decompression dive when the no-decompression limits are exceeded. This means that during the dive, the diver went deeper or stayed longer than what is considered safe for a direct ascent to the surface without the risk of decompression sickness.

No-decompression limits are pre-established guidelines that help divers determine the maximum time they can spend at a certain depth before needing to come up in stages. If these limits are surpassed, divers must perform decompression stops during their ascent to allow inert gases, primarily nitrogen, to be off-gassed safely from their bodies to prevent bubbles from forming, which could lead to serious health issues.

Understanding this concept is crucial for safe diving practices, as failing to acknowledge the importance of adhering to no-decompression limits can result in increased risk of injury or decompression sickness.