Instead of sound for detection, what if you had a water activated smoke bomb type container that would let out white or black smoke every 15 min. for 5 min. or for other set times. One container could be set for instant activation, second one could be set to activate one or two days after contact with water and so on. It would be easy to see black smoke on the water. with testing and fine tuning I believe this would work better than sound.
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