During which situation should a lifeguard blow a whistle repeatedly?

In the context of lifeguarding, blowing a whistle repeatedly serves as a crucial alert signal, particularly in emergency situations. This action is designed to capture immediate attention and prompt a swift response from both patrons and fellow lifeguards. When a lifeguard perceives a potentially perilous situation, such as a drowning, injury, or any critical incident requiring urgent attention, the repeated whistle blows serve as an unmistakable call for immediate action.

In other scenarios, such as addressing unruly behavior or indicating breaks, while a whistle may still be used, those situations typically require a different approach and may not necessitate the immediate and urgent attention that an emergency does. Therefore, the emphasis on using a whistle repeatedly during emergencies ensures that it clearly communicates the need for prompt intervention, prioritizing the safety of all individuals in the aquatic environment.