CNN Legal View With Ashleigh Banfield March 19, 2014 16:24:00
Order to get how close do you have to be? >> well, you know, ideally, within a few miles. there have been situations where they have been able to pick them up more than just a few miles away, two, three miles and then further out they have picked them up. but that's why they send the ships back and forth. it's easier if they can hear them right on top. and then that's also why they send the submersibles, the unmanned submarines that go down and to listen and find them. and so the navy equipment and the coast guard equipment in this country, the coast guard equipment, is very important to try t...