If a diver's computer fails during a dive and they don't have a backup, what is the proper procedure?

When a diver's computer fails during a dive and no backup is available, the safest course of action is to ascend, make a safety stop, and then end the dive. This procedure prioritizes the diver's safety and well-being.

Ascent is necessary because continuing at depth without a reliable means of monitoring depth or time can lead to dangerous situations such as decompression sickness. By choosing to ascend, the diver can safely bring themselves to shallower waters where they can monitor their conditions more closely.

Including a safety stop during this ascent is vital, as it allows nitrogen absorbed during the dive to be released more gradually from the body, minimizing the risk of problems associated with decompression. Ending the dive is appropriate in this situation, as the diver is unable to obtain critical data that informs safe diving practices due to the computer's failure.

Overall, this response effectively addresses the immediate situation and adheres to safe diving protocols, ensuring that divers can return to the surface safely.