Diver Down Flag - Official Signal for Underwater Diving Activity #1301288 (License: Personal Use)

The diver down flag consists of a rectangular design split vertically into a white left half and a blue right half, with the blue section ending in a diagonal cut toward the hoist side. It is used globally to indicate that scuba or skin divers are operating underwater in the vicinity, serving as a critical maritime safety signal. Boaters are legally required in many jurisdictions to maintain a safe distance when this flag is displayed.

This image is commonly used on marine safety websites, dive certification pages, boating regulations guides, and educational materials about water recreation safety. It matches user intent for understanding diving signals, preparing for a dive trip, or complying with local boating laws.