What action should lifeguards take to quickly draw attention from other staff during an emergency?

Blowing a whistle repeatedly is an effective action for lifeguards during an emergency because the sound of the whistle carries over distances and can be distinctive in a noisy environment, such as a pool or beach. Whistles are designed to be loud and clear, making them a reliable tool for alerting not only immediate bystanders but also other staff members who may be further away. The repetitive sound can quickly signal that there is an urgent situation requiring additional assistance.

In contrast, simply shouting, while it may grab attention, can be less effective due to the variability in voice projection and the surrounding noise levels. Waving arms may not be as recognizable as a formal signal of an emergency and might be misunderstood or overlooked. Using a flashlight can also be useful in low-light conditions, but it might not be as readily noticed during the day or in well-lit areas. Whistles combine sound and ease of use, making them the preferred method to ensure rapid attention from others during critical moments.