A diver down flag, or scuba flag, is a flag used on the water to indicate that there is a diver below. In North America it is conventionally red with a white stripe from the upper left corner to the lower right corner. Internationally, the code flag alfa/alpha, which is white and blue, is used to signal that the vessel has a diver down and other vessels should keep well clear at slow speed.
Read more about Diver Down Flag: Purpose, Signal Flag ALFA/ALPHA, Other Uses
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“Hath not the morning dawned with added light?
And shall not evening call another star
Out of the infinite regions of the night,
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Another flag unfurled!”
—Henry Timrod (1828–1867)