CNN At This Hour With Berman and Michaela April 3, 2014 15:49:00
Passive and active sonar. theyre really sensitive. this is used to track other submarines, hunt and kill russian subs. sonar systems are super sensitive. >> it gives more range because its faster and better capability to find things. >> absolutely. the listening bit, its listening for pings. as we pointed out were down to the last few days of this now. we know from experts, the battery life could last up to 40 days. were nudging on that final ten days. >> could be 20 days based on how theyre sto...
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