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:
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Other articles related to "alarm, alarms, alarm signal, alarm signals":
... Alarm Deactivator As its name suggests, this gadget is used to deactivate alarms ... One end is clipped to where the alarm signal is going in, the other end is clipped to where the matching alarm signal is going out ... The alarm signal is harmlessly re-directed into the Alarm Deactivator, effectively deactivating the alarm ...
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