What should rescuers listen for when attempting to make radio contact is not possible?

When rescuers are unable to establish radio contact during an emergency situation, listening for activated personal alert safety system (PASS) devices is crucial. PASS devices are designed specifically to emit loud alarm sounds to indicate that a firefighter or individual is in distress or has become immobilized. The sound is distinct and can help rescuers locate the individual, particularly in high-noise environments like a structure fire.

The primary function of a PASS device is to alert others to the presence of an individual who may be in danger. Rescuers can focus their efforts on locating the source of the alarm, facilitating a quicker and potentially life-saving rescue. This makes it a critical element of safety for both the rescuers and those who may be trapped.

Other options may provide some useful information in certain circumstances, but they do not serve the same purpose of specifically indicating distress. For example, shouting from trapped personnel might be a helpful clue but may not be consistently reliable due to factors such as noise or the physical condition of the trapped individual. Additionally, the noise from fire engines and other equipment can be chaotic and may not provide specific guidance for locating someone in need of help. This underscores the importance of the PASS device as a tool designed for emergency situations.