During daytime, if a diving vessel cannot display the underwater operation shapes, which signal should she display?

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Multiple Choice

During daytime, if a diving vessel cannot display the underwater operation shapes, which signal should she display?

Explanation:
When a vessel is conducting underwater operations during the day, it must display day shapes that signal divers in the water. If those shapes cannot be shown, a rigid replica of the International Code flag Alpha serves as the substitute signal, indicating a diver down and that other vessels should keep well clear. The other flags listed don’t convey this diving operation warning by themselves, so they aren’t appropriate substitutes.

When a vessel is conducting underwater operations during the day, it must display day shapes that signal divers in the water. If those shapes cannot be shown, a rigid replica of the International Code flag Alpha serves as the substitute signal, indicating a diver down and that other vessels should keep well clear. The other flags listed don’t convey this diving operation warning by themselves, so they aren’t appropriate substitutes.

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