Diver Down Flag - Recognize the Blue and White Warning Signal #1441548 (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 used globally to indicate that divers are operating below the surface, and vessels must maintain a safe distance-often 100-300 feet depending on local laws. In the U.S., it’s regulated by state boating agencies and the U.S. Coast Guard.

Used on dive boats, personal watercraft, and shore entries; appears on safety guides, marine signage, and recreational diving websites. Matches user intent for boating safety, dive certification prep, or regulatory compliance.