What is the purpose of a sound-powered telephone in damage control?

• A. To broadcast alarms from the bridge
• B. To measure sound levels in compartments
• C. To operate remotely from the DCC
• D. To provide independent, power-free communication between compartments during casualties when electrical systems may be down.

Answer: (D)

Independent, power-free voice communication is the purpose. A sound-powered telephone runs on the operator’s own voice—no batteries or electrical power are required—so it stays usable even when the ship’s electrical systems are down or damaged. In damage control, that reliability is crucial: crew can pass commands, share status, and coordinate actions between compartments and the Damage Control Central without depending on intact power or powered communications. It’s specifically meant for direct, local communication across spaces during casualties. This isn’t about broadcasting alarms, measuring sound levels, or operating remotely from the DCC; those functions belong to other systems, whereas the sound-powered telephone provides a guaranteed, independent link when power failures disable other means of communication.