Storm Whistle
These are the loudest whistles in the world; 75% louder than your average whistle. I haven't tested the claim that it can be heard fifty feet under water, but I believe it.
I used one of these to signal a canoes that were separated from our group a half a mile or more away and out of sight. They heard the signal clearly.
Ear splittingly loud (cover your ears) and highly recommended.
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