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The red arrow above points to the time that this audio clip was recorded.
This is the sound of a common light bulb imploding due to the pressure
of the water at about 30 meters depth. This breaking light bulb was about
600 meters away from the hydrophone that recorded it.
Over 50 light bulbs were weighted and dropped into the water forming
a circle
around the "Shark of Science" hydrophone array. We use this
sound to determine the actual positions of all 32 hydrophones on the
the array, by calculating the intersection of all the acoustic
paths from each bulb to a certain hydrophone.
