CNN At This Hour With Berman and Michaela April 3, 2014 15:49:00
Passive and active sonar. they're really sensitive. this is used to track other submarines, hunt and kill russian subs. sonar systems are super sensitive. >> it gives more range because it's faster and better capability to find things. >> absolutely. the listening bit, it's listening for pings. as we pointed out we're down to the last few days of this now. we know from experts, the battery life could last up to 40 days. we're nudging on that final ten days. >> could be 20 days based on how they're stored. >> the pinger running out of juice if it has any left. >> and it was functions right. c...
Source: archive.org