Which action is NOT advisable when an enriched air computer fails?

When an enriched air computer fails, attempting to repair the device underwater is not advisable. The reason for this is primarily centered around safety and the complexities involved in handling potentially malfunctioning equipment in an underwater environment. Trying to fix a delicate instrument like a dive computer can create additional risks, such as losing control of buoyancy or not managing your surroundings properly while distracted by the repair process.

Instead, divers are encouraged to take steps that ensure their safety, such as ascending to a shallower depth, making a safety stop, and ultimately ending the dive safely. These actions prioritize the diver's safety and focus on responsible diving practices in the face of equipment failure.