What should a lifeguard do if a swimmer is found unresponsive?

In the event that a swimmer is found unresponsive, the most critical first step is to call for help, which can include alerting other lifeguards or emergency personnel. Initiating rescue breaths is essential to provide oxygen to an unresponsive individual who may not be breathing adequately. If the swimmer shows no signs of life or breathing, performing CPR becomes necessary to maintain blood circulation and oxygen flow to vital organs until emergency medical services arrive.

This response prioritizes the immediate need for oxygenation and circulation, which are crucial in life-threatening situations. Prompt action can greatly improve the chances of survival and recovery for the unresponsive swimmer. The other options either delay necessary interventions, which can be detrimental, or do not adequately address the urgent need to provide breathing support and maintain circulation.