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In addition to distress signals like Mayday and pan-pan, most vessels, especially passenger ships, use some emergency signals to alert the crew on board. In some cases, the signals may alert the passengers to danger, but, in others, the objective is to conceal the emergency from unaffected passengers so as to avoid panic or undue alarm. Signals can be in the form of blasts on alarm bells, sounds on the ship's whistle or code names paged over the PA system.
More commonly used to alert crew to hull damage on board some lines as well.
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