Abstract: An inflatable flag buoy for divers including a buoyant seat and a flag body in the form of two air chambers separated by a transparent interface. The buoyant seat is further divided into an upper air chamber and a lower water chamber that are not communicable with one another. Water filled in the water chamber always keeps the whole flag buoy in an upright position while air filled in the air chamber always keeps the flag buoy afloat on a water surface. A flashlight may be held in a space below said transparent interface and surrounded by said buoyant seat. The flag body includes communicable post portion and flag portion that is centered at a top of the post portion. Light given out by the flashlight passes through the transparent interface and the post portion to project onto and lighten the flag portion to produce good warning effect in the night. Pockets and recesses are provided on the post portion and the buoyant seat for conveniently holding miscellaneous articles, beverage bottles, etc.

Abstract: Disclosed is a safety stop anchor including a buoy distantly connected to a diver via a fixing rope. Before the diver returns to the surface, the buoy helps the diver to easily and relaxedly stay at the required safety decompression stop or stops to avoid the caisson disease. A buoyancy control valve is provided on the buoy so that heavy loads can be more easily carried underwater by a neutral buoyancy and to ascend to the water surface.