Diver Down Flag - Recognize the Blue-and-White Warning Signal #171091 (License: Personal Use)

The diver down flag features a vertical split design: white on the left and royal blue on the right, with a diagonal notch cut from the fly end. It is internationally recognized as a warning that scuba or skin divers are operating below the surface, and vessels must maintain a safe distance (typically 100-300 feet depending on jurisdiction). In the U.S., displaying this flag is legally required when divers are in the water and often accompanied by a rigid replica flown from a vessel’s mast or buoy.

Used on dive boats, buoys, and shore entries to alert watercraft; appears on safety guides, marine regulation pages, dive training materials, and boating license exams to reinforce awareness and compliance.