Emergency buoys are used to signal a diver's location and provide flotation in case of emergencies. They are typically inflatable and designed to be visible from a distance. Some emergency buoys are equipped with additional features such as lights or reflective panels to enhance visibility. Proper deployment techniques and regular checks for damage or wear are essential to ensure the buoy functions correctly when needed. These buoys play a critical role in enhancing safety and facilitating rescue operations in emergency situations.