If air supply permits during a computer failure, what is a recommended precaution?

Performing a longer than normal safety stop during a computer failure is a prudent recommendation. Safety stops are designed to allow divers to off-gas nitrogen accumulated in their tissues during the ascent. When a dive computer fails, a diver may not have accurate depth and time information, which can lead to unintentional rapid ascents and increase the risk of decompression sickness.

By extending the safety stop, divers provide additional time at a shallower depth, allowing for safer off-gassing. It serves as a precaution to mitigate any potential risk associated with the unknown factors of their dive profile due to the lack of data from the computer. This choice prioritizes diver safety while managing the uncertainty of the dive conditions resulting from the equipment failure.

Continuing the dive until air runs out, coming up to the surface immediately, or signaling for help before taking any action do not adequately address the increased risks associated with a computer failure and could potentially lead to dangerous situations underwater.