What is the main function of a bottom belay in rescue operations?

The main function of a bottom belay in rescue operations is to slow or stop the descent of a rescuer. This is crucial because during a rescue, the safety of the rescuer is paramount, and a bottom belay provides an additional layer of control when a person is descending into or working within a confined space. The bottom belay acts as a safety mechanism that allows the belayer (the person managing the rope) to effectively manage the movement of the rescuer. In an emergency situation, having a bottom belay can prevent falls or help to control the speed of descent, making it a vital tool for ensuring the safety of rescue operations.