meters maximum. in the class we were told it could only pick up sounds a mile away from the black box. are you reassessing of how the sounds travel underwater at this point because you are detecting things that are much further apart. again, you heard the commodore say the bottom is a silt bottom. that absorbs sound. funny things happen depending on temperature, temperature layer answer so on and so forth. the characteristics of the water, the characteristics of the ocean floor all come in to play here. the other thing is that in terms of this area the ocean shield went there on the 5th of april.