What is the main purpose of a figure 8 descender in confined space rescue?

The main purpose of a figure 8 descender in confined space rescue is descent control. It functions by allowing the rescuer to manage their speed while descending into or ascending out of a confined space. The design of the figure 8 descender creates friction against the rope, which provides an effective means to slow down or stop the descent, thereby ensuring that the rescuer can safely navigate through potentially hazardous environments.

This device is particularly beneficial in rescue scenarios where precise control over speed is critical to ensuring the rescuer's safety and the safety of any individuals being rescued. By adjusting the amount of rope passing through the descender, the rescuer can fine-tune their descent, which is essential in situations where visibility may be limited, or conditions may change rapidly.

In contrast, a metal plate that is used as a brake or any type of harness are components utilized in various aspects of rope rescue but do not specifically describe the primary function of a figure 8 descender. Additionally, a tool for measuring depth does not pertain to the operational use of a descender, as it is unrelated to the functions needed for managing descent in confined space scenarios.