Alarm Signal
The "General Emergency Alarm" consists of 7 short blasts followed by 1 long blast of the ship's horn or whistle (some lines don't sound the signal on the horn or whistle) and by the ship's internal alarm (such as fire alarm bells) accompanied with flashing strobe lights in corridors and public areas for hearing impaired) and PA systems with a tone.
Signal: 7 short and 1 long:
Read more about this topic: Muster Drill
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