What indicates a 'Diver Down' flag?

The 'Diver Down' flag, which is officially recognized, is a red flag with a white diagonal stripe extending from the top of the flag to the bottom. This flag is used to signal that there is a diver in the water and serves as a warning to other boaters to maintain a safe distance. The purpose of the flag is to ensure the safety of divers by alerting boaters that they should be cautious and watch for individuals beneath the water's surface.

This flag communicates important information about the presence of divers and the need to avoid navigating too close to the area where divers are submerged. The specific design of this flag draws attention due to its contrasting colors, making it easily recognizable on the water. Other flags mentioned, such as yellow or green flags, do not carry the same meaning and are used for different purposes in nautical signaling.