What is one of the types of dive flags mentioned?

The Alpha flag is one of the dive flags recognized internationally and is specifically designed to indicate that diving activity is taking place in a particular area. It is a blue and white flag that signals to boats and other vessels that divers are in the water, thereby urging them to proceed with caution. When a diver sees an Alpha flag, it serves as a notification that they should be ware of potential hazards and reduce their speed to avoid disturbing the divers, as well as to ensure safety for everyone involved.

The other flags listed do not serve this specific purpose related to diving. The yellow flag, while used in various contexts, is not a standard symbol for indicating diving activity. The green flag typically indicates conditions are safe for swimming but does not have a specific association with diving. The orange flag is not recognized as a diving flag either. Understanding the purpose and recognition of the Alpha flag is crucial for safety during diving activities and for ensuring proper communication with vessels in nearby waters.