What is indicated by two long whistle blasts?

Two long whistle blasts are a standard emergency signal in lifeguard training, and they indicate a significant event or situation requiring immediate action. This signal alerts both patrons and lifeguards that there may be a serious incident, such as a swimmer in distress or a need for emergency services.

In this context, the correct response would mean that individuals should exit the pool area promptly and that the lifeguard must take appropriate steps, which may include calling emergency services like 911. Understanding this signal is crucial for ensuring the safety of swimmers and for a quick response in emergencies. It reflects the importance of communication and immediate action during potential crises at aquatic facilities.