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When dealing with a dive computer failure, having a backup computer is essential for ensuring safety underwater. A dive computer provides crucial data on depth, time, and no-decompression limits, which are integral for avoiding decompression sickness. If a diver's primary computer fails and they have a backup, they can continue monitoring their ascent and adhere to necessary safety precautions.
Using a backup computer allows the diver to maintain awareness of their dive profile, making informed decisions as they ascend. It enhances safety because the diver does not have to rely solely on their memory or other less accurate methods to track their dive data.
In situations where a diver does not have a backup computer, they face serious risks, such as increased potential for decompression sickness, especially if they attempt to dive without an accurate understanding of their dive limits. Thus, option B emphasizes prudent planning and preparation for dives, ensuring that divers can respond appropriately in case of equipment failure. This approach maintains not only the safety of the diver but also reflects responsible diving practices.