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- Q151 - Deck Safety
58. What color signal flare is sent up by a submarine to indicate an emergency?
Submarines signal emergencies with red flares, as specified in the International Regulations for Preventing Collisions at Sea (COLREGS) Annex IV — Distress Signals. Red flares are the internationally recognized color for distress signals, indicating a need for immediate assistance, while other colors are used for different purposes.
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