21
OTS POWERCOM
ZONES OF SILENCE
Large natural or man-made objects can block acoustical transmission under
certain conditions, in much the same way that a rock blocks a fast-moving
current of water. Close to the backside of the rock, in this example, the
current is absent and the water seems still. A short distance away, the
Similarly, acoustic energy in the water can be blocked if the transmitting
source is close to a large object. On the backside of the blocking object,
around, or above the blocking object until communication is reestablished.
Under some conditions, when your diving suit is directly between the
ranges. Turning approximately 45 degrees in any direction eliminates this
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