What safety measure should be taken before approaching the edge of a cliff during a rescue?

Ensuring that you are tied in with a rope is a critical safety measure when approaching the edge of a cliff during a rescue operation. This practice is fundamental in rope rescue scenarios, as it provides a security system that can prevent a fall if an individual were to lose their footing or if the ground were to give way. Being tethered gives rescuers a means of arresting a fall immediately, thereby minimizing the risk of serious injury or death.

In a rescue situation, the environment can be unpredictable, and the terrain may be unstable. Having a safety rope attached to a secure point or a teammate allows for safer navigation near steep edges. This method keeps the rescuer connected to a reliable anchor point, which is essential for maintaining safety.

The other options do not provide the same level of safety. For instance, approaching within 3 feet or detaching from harnesses introduces unnecessary risk. Using a safety net below can be helpful but does not address the immediate safety needs of rescuers as they approach precarious ledges. Therefore, being tied in with a rope is the most effective way to ensure safety when working near high risks, such as cliff edges.