During an emergency swimming ascent, how should you handle your regulator?

Retaining the regulator in your mouth during an emergency swimming ascent is crucial for maintaining a safe supply of breathable gas. In a situation where an emergency ascent is necessary, it is vital to continue breathing to prevent the potentially life-threatening effects of hypoxia or drowning. Keeping the regulator in your mouth ensures that you are receiving air while ascending, allowing you to manage your buoyancy and control your ascent rate.

Moreover, in an emergency situation, having the regulator readily available in your mouth allows for quick adjustments to your breathing as needed, particularly if your conditions change during the ascent. It ensures that you remain calm, as the act of breathing can help reduce anxiety and maintain focus on executing the ascent safely.

In situations like this, the other actions—such as discarding the regulator over your shoulder or signaling your buddy—would prevent you from receiving essential air, thereby increasing your risk of serious injury or loss of consciousness during the ascent.