Red and Yellow Diagonal Flag - Nautical Diver Down Signal #198319 (License: Personal Use)

This is the standard diver-down flag used globally to indicate that scuba or surface divers are operating in the area. The flag features a bold diagonal division: red in the upper hoist (top-left) triangle and yellow in the lower fly (bottom-right) triangle, enclosed by a black border for high contrast. It is flown from boats, buoys, or shore stations to alert mariners to proceed with caution and maintain a safe distance.

Used primarily in maritime and recreational diving contexts, this image appears on safety guides, dive certification materials, boating regulations pages, and marine signage. It matches user intent for understanding dive safety symbols, preparing for water activities, or complying with local boating laws.