What type of flags signal that divers are in the water?

The flag that signals that divers are in the water is a red flag with a white diagonal stripe, commonly recognized as the "diver-down flag." This flag is used to indicate to other boaters that there are divers underwater, promoting safety by advising them to keep a safe distance and be cautious when navigating in the area. The bright red color makes it highly visible, while the white diagonal stripe clearly distinguishes it from other flags. Using this flag is essential for diver safety, as it alerts nearby vessels to the potential hazards posed by divers in proximity to the water surface.