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Area because any chance of hearing the ping, you want it to be as pristine and quiet so nothing interferes with that. >> the fact that they heard a fifth ping, a false alarm, the fact that they havent heard any since the first four, that would reinforce the notion that the batteries are most likely dead? >> its also important that the false positive, the sonobuoy may have had a hit, thats fairly common in sonar work. you look at the accumulation of evidence and how things line up. they are doing...